diff --git a/src/editor/level_editor.jai b/src/editor/level_editor.jai
index 7e0c327..b552d38 100644
--- a/src/editor/level_editor.jai
+++ b/src/editor/level_editor.jai
@@ -607,8 +607,9 @@ create_level_editor_preview_tasks :: () {
 draw_level_editor :: () {
 	curworld := get_current_world();
 	if !curworld.valid then return;
-	create_set_cam_rendering_task(get_level_editor_camera(), effective_plane_height(*curworld.world.conf));
-	create_world_rendering_tasks(*curworld.world);
+	cam := get_level_editor_camera();
+	create_set_cam_rendering_task(cam, effective_plane_height(*curworld.world.conf));
+	create_world_rendering_tasks(*curworld.world, cam);
 	if show_trile_preview && !trile_preview_disabled {
 		create_level_editor_preview_tasks();
 	}
diff --git a/src/main.jai b/src/main.jai
index 5c94c7a..0daa0a3 100644
--- a/src/main.jai
+++ b/src/main.jai
@@ -196,10 +196,10 @@ frame :: () {
     if !in_editor_view then delta_time_accumulator += delta_time;
 
     if !in_editor_view {
-        while delta_time_accumulator > (1.0/60.0) {
-            game_tick(1.0/60.0);
-            delta_time_accumulator -= (1.0/60.0);
-        }
+        // while delta_time_accumulator > (1.0/60.0) {
+            game_tick(1.0/144.0);
+            // delta_time_accumulator -= (1.0/60.0);
+        // }
     }
     fonsClearState(state.fons);
     for event: Input.events_this_frame {
diff --git a/src/rendering/backend_sokol.jai b/src/rendering/backend_sokol.jai
index 7d7eaea..2df4f49 100644
--- a/src/rendering/backend_sokol.jai
+++ b/src/rendering/backend_sokol.jai
@@ -153,12 +153,29 @@ backend_draw_trile_positions_gbuffer :: (trile : string, amount : s32, worldConf
 
 backend_draw_trile_positions_main :: (trile : string, amount : s32, worldConf: *World_Config, chunk_key: Chunk_Key, is_preview: bool = false) {
     start_frame_profiling_group("Draw trile positions");
-    mvp : Matrix4;
-    if !in_shadowmap_pass {
-        mvp = create_viewproj(*camera);
-    } else {
-        mvp = shadow_mvp;
+
+    trilegfx := get_trile_gfx(trile);
+    offset := trile_offsets[current_trile_offset_index];
+    current_trile_offset_index += 1;
+
+    if in_shadowmap_pass {
+        vs_params : Trile_Shadow_Vs_Params;
+        vs_params.mvp = shadow_mvp.floats;
+        bindings : sg_bindings;
+        bindings.vertex_buffers[0]        = trilegfx.vertex_buffer;
+        bindings.vertex_buffers[1]        = trilegfx.normal_buffer;
+        bindings.vertex_buffers[2]        = trilegfx.centre_buffer;
+        bindings.vertex_buffers[3]        = gPipelines.trile.bind.vertex_buffers[3];
+        bindings.vertex_buffer_offsets[3] = offset;
+        sg_apply_pipeline(gPipelines.trile_shadow.pipeline);
+        sg_apply_bindings(*bindings);
+        sg_apply_uniforms(UB_trile_shadow_vs_params, *(sg_range.{ ptr = *vs_params, size = size_of(type_of(vs_params)) }));
+        sg_draw(0, cast(s32) trilegfx.vertex_count, amount);
+        end_frame_profiling_group("Draw trile positions");
+        return;
     }
+
+    mvp := create_viewproj(*camera);
 	vs_params : Trile_Vs_Params;
 	vs_params.mvp = mvp.floats;
 	vs_params.mvp_shadow = shadow_mvp.floats;
@@ -168,10 +185,6 @@ backend_draw_trile_positions_main :: (trile : string, amount : s32, worldConf: *
     world_config_to_shader_type(worldConf, *world_conf);
     world_conf.planeHeight = effective_plane_height(worldConf);
 
-    offset := trile_offsets[current_trile_offset_index];
-    current_trile_offset_index += 1;
-
-    trilegfx := get_trile_gfx(trile);
     bindings : sg_bindings;
     bindings.vertex_buffers[0]         = trilegfx.vertex_buffer;
     bindings.vertex_buffers[1]         = trilegfx.normal_buffer;
@@ -182,14 +195,7 @@ backend_draw_trile_positions_main :: (trile : string, amount : s32, worldConf: *
     bindings.images[0]                 = trilegfx.trixel_colors;
     bindings.images[1]                 = g_ssaobuf;
     bindings.samplers[2]               = g_shadowmap_sampler;
-    if !in_shadowmap_pass {
-        bindings.images[2]                 = g_shadowmap;
-    } else {
-        // Just put something in this slot instead of the shadowmap
-        // so we don't have a circular shadowmap drawing situation.
-        // The texture is not used in shadowmap pass.
-        bindings.images[2]                 = g_rendertex_depth;
-    }
+    bindings.images[2]                 = g_shadowmap;
 
     // Bind RDM textures for this chunk. Fall back to a 1x1 black image when
     // no baked data is available so sokol doesn't drop the draw call.
@@ -222,7 +228,7 @@ backend_draw_trile_positions_main :: (trile : string, amount : s32, worldConf: *
     fs_params.ambient_color     = lc.ambient_color.component;
     fs_params.is_preview        = ifx is_preview then cast(s32)1 else cast(s32)0;
     fs_params.rdm_tint          = lc.rdm_tint.component;
-    
+
     sg_apply_bindings(*bindings);
     sg_apply_uniforms(UB_trile_fs_params, *(sg_range.{ ptr = *fs_params, size = size_of(type_of(fs_params)) }));
     sg_apply_uniforms(UB_trile_vs_params, *(sg_range.{ ptr = *vs_params, size = size_of(type_of(vs_params))}));
diff --git a/src/rendering/helpers.jai b/src/rendering/helpers.jai
index ff237b3..03681e9 100644
--- a/src/rendering/helpers.jai
+++ b/src/rendering/helpers.jai
@@ -18,45 +18,107 @@ Gathered_Positions :: struct {
     positions: [..]Vector4;
 }
 
-create_world_rendering_tasks :: (world: *World) {
+// Extract 6 frustum planes from an MVP matrix using the Gribb-Hartmann method.
+// Each plane is vec4(A,B,C,D) where dot(plane.xyz, point) + plane.w >= 0 means inside.
+// Accounts for Jai row-major storage being transposed when uploaded to OpenGL.
+extract_frustum_planes :: (mvp: Matrix4) -> [6]Vector4 {
+    planes : [6]Vector4;
+    m := mvp;
+    planes[0] = .{m._14+m._11, m._24+m._21, m._34+m._31, m._44+m._41}; // left
+    planes[1] = .{m._14-m._11, m._24-m._21, m._34-m._31, m._44-m._41}; // right
+    planes[2] = .{m._14+m._12, m._24+m._22, m._34+m._32, m._44+m._42}; // bottom
+    planes[3] = .{m._14-m._12, m._24-m._22, m._34-m._32, m._44-m._42}; // top
+    planes[4] = .{m._14+m._13, m._24+m._23, m._34+m._33, m._44+m._43}; // near
+    planes[5] = .{m._14-m._13, m._24-m._23, m._34-m._33, m._44-m._43}; // far
+    return planes;
+}
+
+// Returns false if the AABB is completely outside any single frustum plane (fast rejection).
+aabb_in_frustum :: (planes: [6]Vector4, bmin: Vector3, bmax: Vector3) -> bool {
+    for plane: planes {
+        px := ifx plane.x >= 0 then bmax.x else bmin.x;
+        py := ifx plane.y >= 0 then bmax.y else bmin.y;
+        pz := ifx plane.z >= 0 then bmax.z else bmin.z;
+        if plane.x*px + plane.y*py + plane.z*pz + plane.w < 0  return false;
+    }
+    return true;
+}
+
+create_world_rendering_tasks :: (world: *World, camera: Camera) {
     create_sky_rendering_task(*world.conf);
     create_set_light_rendering_task(*world.conf);
 
-    // Gather all trile positions from chunks, grouped by trile type.
-    gathered: [..]Gathered_Positions;
+    cam_mvp    := create_viewproj(*camera);
+    shadow_mvp := create_shadow_viewproj(*camera, *world.conf);
+    cam_planes    := extract_frustum_planes(cam_mvp);
+    shadow_planes := extract_frustum_planes(shadow_mvp);
+
+    // Gather positions for camera-visible instances (all passes) and
+    // shadow-only instances (chunks visible from sun but not camera).
+    gathered      : [..]Gathered_Positions;
     gathered.allocator = temp;
+    shad_gathered : [..]Gathered_Positions;
+    shad_gathered.allocator = temp;
+
+    find_or_create :: (list: *[..]Gathered_Positions, name: string, chunk_key: Chunk_Key) -> *Gathered_Positions {
+        for *g: list.* {
+            if g.name == name && g.chunk_key == chunk_key  return g;
+        }
+        array_add(list, .{name = name, chunk_key = chunk_key});
+        g := *list.*[list.count - 1];
+        g.positions.allocator = temp;
+        return g;
+    }
 
     for chunk: world.chunks {
+        bmin := Vector3.{chunk.coord.x * 32.0, chunk.coord.y * 32.0, chunk.coord.z * 32.0};
+        bmax := bmin + .{32, 32, 32};
+
+        in_cam  := aabb_in_frustum(cam_planes,    bmin, bmax);
+        in_shad := aabb_in_frustum(shadow_planes, bmin, bmax);
+        if !in_cam && !in_shad  continue;
+
         for group: chunk.groups {
-            // Find or create the gathered entry for this (chunk, trile_type) pair.
-            target: *Gathered_Positions = null;
-            for *g: gathered {
-                if g.name == group.trile_name && g.chunk_key == chunk.coord {
-                    target = g;
-                    break;
-                }
-            }
-            if !target {
-                array_add(*gathered, .{name = group.trile_name, chunk_key = chunk.coord});
-                target = *gathered[gathered.count - 1];
-                target.positions.allocator = temp;
-            }
             for inst: group.instances {
                 wx, wy, wz := chunk_local_to_world(chunk.coord, inst.x, inst.y, inst.z);
-                array_add(*target.positions, Vector4.{cast(float) wx, cast(float) wy, cast(float) wz, cast(float) inst.orientation});
+                imin := Vector3.{cast(float)wx, cast(float)wy, cast(float)wz};
+                imax := imin + .{1, 1, 1};
+
+                inst_cam  := in_cam  && aabb_in_frustum(cam_planes,    imin, imax);
+                inst_shad := in_shad && aabb_in_frustum(shadow_planes, imin, imax);
+                if !inst_cam && !inst_shad  continue;
+
+                pos := Vector4.{cast(float)wx, cast(float)wy, cast(float)wz, cast(float)inst.orientation};
+                if inst_cam {
+                    target := find_or_create(*gathered, group.trile_name, chunk.coord);
+                    array_add(*target.positions, pos);
+                } else {
+                    target := find_or_create(*shad_gathered, group.trile_name, chunk.coord);
+                    array_add(*target.positions, pos);
+                }
             }
         }
     }
 
     for g: gathered {
-        if g.positions.count < 1 then continue;
-        triletask := Rendering_Task_Trile.{};
-        triletask.trile = g.name;
+        if g.positions.count < 1  continue;
+        triletask : Rendering_Task_Trile;
+        triletask.trile     = g.name;
         triletask.chunk_key = g.chunk_key;
         triletask.positions = g.positions;
         triletask.worldConf = *world.conf;
         add_rendering_task(triletask);
     }
+    for g: shad_gathered {
+        if g.positions.count < 1  continue;
+        triletask : Rendering_Task_Trile;
+        triletask.trile       = g.name;
+        triletask.chunk_key   = g.chunk_key;
+        triletask.positions   = g.positions;
+        triletask.worldConf   = *world.conf;
+        triletask.shadow_only = true;
+        add_rendering_task(triletask);
+    }
 
     create_ground_rendering_task(world);
 }
diff --git a/src/rendering/pipelines.jai b/src/rendering/pipelines.jai
index 4bbf0d3..61311f7 100644
--- a/src/rendering/pipelines.jai
+++ b/src/rendering/pipelines.jai
@@ -56,6 +56,9 @@ gPipelines : struct {
     // Renders sets of triles
     trile  : Pipeline_Binding;
 
+    // Depth-only shadow pass for triles (no lighting/RDM)
+    trile_shadow : Pipeline_Binding;
+
     // Renders the ground plane. (just water)
     plane  : Pipeline_Binding;
 
@@ -140,6 +143,7 @@ create_pipelines :: () {
     create_arbtri_pipeline();
     create_trixel_pipeline();
     create_trile_pipeline();
+    create_trile_shadow_pipeline();
     create_sky_pipeline();
     create_plane_pipeline();
     create_postprocess_pipeline();
@@ -408,6 +412,28 @@ create_trile_pipeline :: () {
     }));
 }
 
+create_trile_shadow_pipeline :: () {
+    pipeline: sg_pipeline_desc;
+    shader_desc := trile_shadow_shader_desc(sg_query_backend());
+    pipeline.shader = sg_make_shader(*shader_desc);
+    pipeline.layout.buffers[0].stride = 4*3;
+    pipeline.layout.buffers[1].stride = 4*3;
+    pipeline.layout.buffers[3].step_func = .PER_INSTANCE;
+    // Explicit locations matching layout(location=N) in the shader.
+    pipeline.layout.attrs[0] = .{ format = .FLOAT3, buffer_index = 0 }; // position
+    pipeline.layout.attrs[1] = .{ format = .FLOAT3, buffer_index = 1 }; // normal (slot match)
+    pipeline.layout.attrs[2] = .{ format = .FLOAT3, buffer_index = 2 }; // centre (slot match)
+    pipeline.layout.attrs[3] = .{ format = .FLOAT4, buffer_index = 3 }; // instance
+    pipeline.depth = .{
+        write_enabled = true,
+        compare       = .LESS_EQUAL,
+        pixel_format  = .DEPTH,
+    };
+    pipeline.color_count = 1;
+    pipeline.colors[0].pixel_format = .RGBA32F;
+    gPipelines.trile_shadow.pipeline = sg_make_pipeline(*pipeline);
+}
+
 create_sky_pipeline :: () {
     pipeline: sg_pipeline_desc;
     shader_desc := sky_shader_desc(sg_query_backend());
diff --git a/src/rendering/tasks.jai b/src/rendering/tasks.jai
index 5d39e84..9c95f42 100644
--- a/src/rendering/tasks.jai
+++ b/src/rendering/tasks.jai
@@ -57,6 +57,7 @@ Rendering_Task_Trile :: struct {
     positions   : []Vector4;
     worldConf   : *World_Config;
     is_preview  : bool = false;
+    shadow_only : bool = false; // only submit to shadow bucket (frustum-culled from camera)
 }
 
 Rendering_Task_Trixels :: struct {
@@ -115,7 +116,9 @@ tasks_to_commands :: () {
                 drawPositionsCmd.amount = cast(s32)trileTask.positions.count;
                 drawPositionsCmd.conf = trileTask.worldConf;
                 drawPositionsCmd.is_preview = trileTask.is_preview;
-                if trileTask.is_preview {
+                if trileTask.shadow_only {
+                    array_add(*render_command_buckets.shadow, drawPositionsCmd);
+                } else if trileTask.is_preview {
                     array_add(*render_command_buckets.main, drawPositionsCmd);
                 } else {
                     array_add(*render_command_buckets.reflection, drawPositionsCmd);
diff --git a/src/shaders/jai/shader_trile_shadow.jai b/src/shaders/jai/shader_trile_shadow.jai
new file mode 100644
index 0000000..5cb9274
--- /dev/null
+++ b/src/shaders/jai/shader_trile_shadow.jai
@@ -0,0 +1,907 @@
+/*
+    #version:1# (machine generated, don't edit!)
+
+    Generated by sokol-shdc (https://github.com/floooh/sokol-tools)
+
+    Cmdline:
+        sokol-shdc -i shader_trile_shadow.glsl -o ./jai/shader_trile_shadow.jai -l glsl430:glsl300es:metal_macos -f sokol_jai
+
+    Overview:
+    =========
+    Shader program: 'trile_shadow':
+        Get shader desc: trile_shadow_shader_desc(sg_query_backend())
+        Vertex Shader: vs_trile_shadow
+        Fragment Shader: fs_trile_shadow
+        Attributes:
+            ATTR_trile_shadow_position => 0
+            ATTR_trile_shadow_normal => 1
+            ATTR_trile_shadow_centre => 2
+            ATTR_trile_shadow_instance => 3
+    Bindings:
+        Uniform block 'trile_shadow_vs_params':
+            Jai struct: Trile_Shadow_Vs_Params
+            Bind slot: UB_trile_shadow_vs_params => 0
+*/
+ATTR_trile_shadow_position :: 0;
+ATTR_trile_shadow_normal :: 1;
+ATTR_trile_shadow_centre :: 2;
+ATTR_trile_shadow_instance :: 3;
+UB_trile_shadow_vs_params :: 0;
+Trile_Shadow_Vs_Params :: struct {
+    mvp: [16]float;
+};
+/*
+    #version 430
+
+    uniform vec4 trile_shadow_vs_params[4];
+    layout(location = 3) in vec4 instance;
+    layout(location = 0) in vec4 position;
+    layout(location = 1) in vec4 normal;
+    layout(location = 2) in vec4 centre;
+
+    mat3 rot_x(float a)
+    {
+        float _28 = cos(a);
+        float _31 = sin(a);
+        return mat3(vec3(1.0, 0.0, 0.0), vec3(0.0, _28, -_31), vec3(0.0, _31, _28));
+    }
+
+    mat3 rot_z(float a)
+    {
+        float _47 = cos(a);
+        float _50 = sin(a);
+        return mat3(vec3(_47, -_50, 0.0), vec3(_50, _47, 0.0), vec3(0.0, 0.0, 1.0));
+    }
+
+    mat3 rot_y(float a)
+    {
+        float _64 = cos(a);
+        float _67 = sin(a);
+        return mat3(vec3(_64, 0.0, _67), vec3(0.0, 1.0, 0.0), vec3(-_67, 0.0, _64));
+    }
+
+    mat3 get_orientation_matrix(int ori)
+    {
+        int _82 = ori / 4;
+        mat3 base;
+        if (_82 == 0)
+        {
+            base = mat3(vec3(1.0, 0.0, 0.0), vec3(0.0, 1.0, 0.0), vec3(0.0, 0.0, 1.0));
+        }
+        else
+        {
+            if (_82 == 1)
+            {
+                float param = 3.1415927410125732421875;
+                base = rot_x(param);
+            }
+            else
+            {
+                if (_82 == 2)
+                {
+                    float param_1 = -1.57079637050628662109375;
+                    base = rot_z(param_1);
+                }
+                else
+                {
+                    if (_82 == 3)
+                    {
+                        float param_2 = 1.57079637050628662109375;
+                        base = rot_z(param_2);
+                    }
+                    else
+                    {
+                        if (_82 == 4)
+                        {
+                            float param_3 = 1.57079637050628662109375;
+                            base = rot_x(param_3);
+                        }
+                        else
+                        {
+                            float param_4 = -1.57079637050628662109375;
+                            base = rot_x(param_4);
+                        }
+                    }
+                }
+            }
+        }
+        float param_5 = float(ori % 4) * 1.57079637050628662109375;
+        return base * rot_y(param_5);
+    }
+
+    void main()
+    {
+        int param = int(round(instance.w));
+        gl_Position = mat4(trile_shadow_vs_params[0], trile_shadow_vs_params[1], trile_shadow_vs_params[2], trile_shadow_vs_params[3]) * vec4(((get_orientation_matrix(param) * (position.xyz - vec3(0.5))) + vec3(0.5)) + instance.xyz, 1.0);
+    }
+
+*/
+vs_trile_shadow_source_glsl430 := u8.[
+    0x23,0x76,0x65,0x72,0x73,0x69,0x6f,0x6e,0x20,0x34,0x33,0x30,0x0a,0x0a,0x75,0x6e,
+    0x69,0x66,0x6f,0x72,0x6d,0x20,0x76,0x65,0x63,0x34,0x20,0x74,0x72,0x69,0x6c,0x65,
+    0x5f,0x73,0x68,0x61,0x64,0x6f,0x77,0x5f,0x76,0x73,0x5f,0x70,0x61,0x72,0x61,0x6d,
+    0x73,0x5b,0x34,0x5d,0x3b,0x0a,0x6c,0x61,0x79,0x6f,0x75,0x74,0x28,0x6c,0x6f,0x63,
+    0x61,0x74,0x69,0x6f,0x6e,0x20,0x3d,0x20,0x33,0x29,0x20,0x69,0x6e,0x20,0x76,0x65,
+    0x63,0x34,0x20,0x69,0x6e,0x73,0x74,0x61,0x6e,0x63,0x65,0x3b,0x0a,0x6c,0x61,0x79,
+    0x6f,0x75,0x74,0x28,0x6c,0x6f,0x63,0x61,0x74,0x69,0x6f,0x6e,0x20,0x3d,0x20,0x30,
+    0x29,0x20,0x69,0x6e,0x20,0x76,0x65,0x63,0x34,0x20,0x70,0x6f,0x73,0x69,0x74,0x69,
+    0x6f,0x6e,0x3b,0x0a,0x6c,0x61,0x79,0x6f,0x75,0x74,0x28,0x6c,0x6f,0x63,0x61,0x74,
+    0x69,0x6f,0x6e,0x20,0x3d,0x20,0x31,0x29,0x20,0x69,0x6e,0x20,0x76,0x65,0x63,0x34,
+    0x20,0x6e,0x6f,0x72,0x6d,0x61,0x6c,0x3b,0x0a,0x6c,0x61,0x79,0x6f,0x75,0x74,0x28,
+    0x6c,0x6f,0x63,0x61,0x74,0x69,0x6f,0x6e,0x20,0x3d,0x20,0x32,0x29,0x20,0x69,0x6e,
+    0x20,0x76,0x65,0x63,0x34,0x20,0x63,0x65,0x6e,0x74,0x72,0x65,0x3b,0x0a,0x0a,0x6d,
+    0x61,0x74,0x33,0x20,0x72,0x6f,0x74,0x5f,0x78,0x28,0x66,0x6c,0x6f,0x61,0x74,0x20,
+    0x61,0x29,0x0a,0x7b,0x0a,0x20,0x20,0x20,0x20,0x66,0x6c,0x6f,0x61,0x74,0x20,0x5f,
+    0x32,0x38,0x20,0x3d,0x20,0x63,0x6f,0x73,0x28,0x61,0x29,0x3b,0x0a,0x20,0x20,0x20,
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+];
+/*
+    #version 430
+
+    layout(location = 0) out vec4 frag_color;
+
+    void main()
+    {
+        frag_color = vec4(0.0);
+    }
+
+*/
+fs_trile_shadow_source_glsl430 := u8.[
+    0x23,0x76,0x65,0x72,0x73,0x69,0x6f,0x6e,0x20,0x34,0x33,0x30,0x0a,0x0a,0x6c,0x61,
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+    0x29,0x3b,0x0a,0x7d,0x0a,0x0a,0x00,
+];
+/*
+    #version 300 es
+
+    uniform vec4 trile_shadow_vs_params[4];
+    layout(location = 3) in vec4 instance;
+    layout(location = 0) in vec4 position;
+    layout(location = 1) in vec4 normal;
+    layout(location = 2) in vec4 centre;
+
+    mat3 rot_x(float a)
+    {
+        float _28 = cos(a);
+        float _31 = sin(a);
+        return mat3(vec3(1.0, 0.0, 0.0), vec3(0.0, _28, -_31), vec3(0.0, _31, _28));
+    }
+
+    mat3 rot_z(float a)
+    {
+        float _47 = cos(a);
+        float _50 = sin(a);
+        return mat3(vec3(_47, -_50, 0.0), vec3(_50, _47, 0.0), vec3(0.0, 0.0, 1.0));
+    }
+
+    mat3 rot_y(float a)
+    {
+        float _64 = cos(a);
+        float _67 = sin(a);
+        return mat3(vec3(_64, 0.0, _67), vec3(0.0, 1.0, 0.0), vec3(-_67, 0.0, _64));
+    }
+
+    mat3 get_orientation_matrix(int ori)
+    {
+        int _82 = ori / 4;
+        mat3 base;
+        if (_82 == 0)
+        {
+            base = mat3(vec3(1.0, 0.0, 0.0), vec3(0.0, 1.0, 0.0), vec3(0.0, 0.0, 1.0));
+        }
+        else
+        {
+            if (_82 == 1)
+            {
+                float param = 3.1415927410125732421875;
+                base = rot_x(param);
+            }
+            else
+            {
+                if (_82 == 2)
+                {
+                    float param_1 = -1.57079637050628662109375;
+                    base = rot_z(param_1);
+                }
+                else
+                {
+                    if (_82 == 3)
+                    {
+                        float param_2 = 1.57079637050628662109375;
+                        base = rot_z(param_2);
+                    }
+                    else
+                    {
+                        if (_82 == 4)
+                        {
+                            float param_3 = 1.57079637050628662109375;
+                            base = rot_x(param_3);
+                        }
+                        else
+                        {
+                            float param_4 = -1.57079637050628662109375;
+                            base = rot_x(param_4);
+                        }
+                    }
+                }
+            }
+        }
+        float param_5 = float(ori % 4) * 1.57079637050628662109375;
+        return base * rot_y(param_5);
+    }
+
+    void main()
+    {
+        int param = int(round(instance.w));
+        gl_Position = mat4(trile_shadow_vs_params[0], trile_shadow_vs_params[1], trile_shadow_vs_params[2], trile_shadow_vs_params[3]) * vec4(((get_orientation_matrix(param) * (position.xyz - vec3(0.5))) + vec3(0.5)) + instance.xyz, 1.0);
+    }
+
+*/
+vs_trile_shadow_source_glsl300es := u8.[
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+    0x00,
+];
+/*
+    #version 300 es
+    precision mediump float;
+    precision highp int;
+
+    layout(location = 0) out highp vec4 frag_color;
+
+    void main()
+    {
+        frag_color = vec4(0.0);
+    }
+
+*/
+fs_trile_shadow_source_glsl300es := u8.[
+    0x23,0x76,0x65,0x72,0x73,0x69,0x6f,0x6e,0x20,0x33,0x30,0x30,0x20,0x65,0x73,0x0a,
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+];
+/*
+    #pragma clang diagnostic ignored "-Wmissing-prototypes"
+
+    #include <metal_stdlib>
+    #include <simd/simd.h>
+
+    using namespace metal;
+
+    struct trile_shadow_vs_params
+    {
+        float4x4 mvp;
+    };
+
+    struct main0_out
+    {
+        float4 gl_Position [[position]];
+    };
+
+    struct main0_in
+    {
+        float4 position [[attribute(0)]];
+        float4 instance [[attribute(3)]];
+    };
+
+    static inline __attribute__((always_inline))
+    float3x3 rot_x(thread const float& a)
+    {
+        float _28 = cos(a);
+        float _31 = sin(a);
+        return float3x3(float3(1.0, 0.0, 0.0), float3(0.0, _28, -_31), float3(0.0, _31, _28));
+    }
+
+    static inline __attribute__((always_inline))
+    float3x3 rot_z(thread const float& a)
+    {
+        float _47 = cos(a);
+        float _50 = sin(a);
+        return float3x3(float3(_47, -_50, 0.0), float3(_50, _47, 0.0), float3(0.0, 0.0, 1.0));
+    }
+
+    static inline __attribute__((always_inline))
+    float3x3 rot_y(thread const float& a)
+    {
+        float _64 = cos(a);
+        float _67 = sin(a);
+        return float3x3(float3(_64, 0.0, _67), float3(0.0, 1.0, 0.0), float3(-_67, 0.0, _64));
+    }
+
+    static inline __attribute__((always_inline))
+    float3x3 get_orientation_matrix(thread const int& ori)
+    {
+        int _82 = ori / 4;
+        float3x3 base;
+        if (_82 == 0)
+        {
+            base = float3x3(float3(1.0, 0.0, 0.0), float3(0.0, 1.0, 0.0), float3(0.0, 0.0, 1.0));
+        }
+        else
+        {
+            if (_82 == 1)
+            {
+                float param = 3.1415927410125732421875;
+                base = rot_x(param);
+            }
+            else
+            {
+                if (_82 == 2)
+                {
+                    float param_1 = -1.57079637050628662109375;
+                    base = rot_z(param_1);
+                }
+                else
+                {
+                    if (_82 == 3)
+                    {
+                        float param_2 = 1.57079637050628662109375;
+                        base = rot_z(param_2);
+                    }
+                    else
+                    {
+                        if (_82 == 4)
+                        {
+                            float param_3 = 1.57079637050628662109375;
+                            base = rot_x(param_3);
+                        }
+                        else
+                        {
+                            float param_4 = -1.57079637050628662109375;
+                            base = rot_x(param_4);
+                        }
+                    }
+                }
+            }
+        }
+        float param_5 = float(ori % 4) * 1.57079637050628662109375;
+        return base * rot_y(param_5);
+    }
+
+    vertex main0_out main0(main0_in in [[stage_in]], constant trile_shadow_vs_params& _193 [[buffer(0)]])
+    {
+        main0_out out = {};
+        int param = int(round(in.instance.w));
+        out.gl_Position = _193.mvp * float4(((get_orientation_matrix(param) * (in.position.xyz - float3(0.5))) + float3(0.5)) + in.instance.xyz, 1.0);
+        return out;
+    }
+
+*/
+vs_trile_shadow_source_metal_macos := u8.[
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+    0x6f,0x75,0x74,0x3b,0x0a,0x7d,0x0a,0x0a,0x00,
+];
+/*
+    #include <metal_stdlib>
+    #include <simd/simd.h>
+
+    using namespace metal;
+
+    struct main0_out
+    {
+        float4 frag_color [[color(0)]];
+    };
+
+    fragment main0_out main0()
+    {
+        main0_out out = {};
+        out.frag_color = float4(0.0);
+        return out;
+    }
+
+*/
+fs_trile_shadow_source_metal_macos := u8.[
+    0x23,0x69,0x6e,0x63,0x6c,0x75,0x64,0x65,0x20,0x3c,0x6d,0x65,0x74,0x61,0x6c,0x5f,
+    0x73,0x74,0x64,0x6c,0x69,0x62,0x3e,0x0a,0x23,0x69,0x6e,0x63,0x6c,0x75,0x64,0x65,
+    0x20,0x3c,0x73,0x69,0x6d,0x64,0x2f,0x73,0x69,0x6d,0x64,0x2e,0x68,0x3e,0x0a,0x0a,
+    0x75,0x73,0x69,0x6e,0x67,0x20,0x6e,0x61,0x6d,0x65,0x73,0x70,0x61,0x63,0x65,0x20,
+    0x6d,0x65,0x74,0x61,0x6c,0x3b,0x0a,0x0a,0x73,0x74,0x72,0x75,0x63,0x74,0x20,0x6d,
+    0x61,0x69,0x6e,0x30,0x5f,0x6f,0x75,0x74,0x0a,0x7b,0x0a,0x20,0x20,0x20,0x20,0x66,
+    0x6c,0x6f,0x61,0x74,0x34,0x20,0x66,0x72,0x61,0x67,0x5f,0x63,0x6f,0x6c,0x6f,0x72,
+    0x20,0x5b,0x5b,0x63,0x6f,0x6c,0x6f,0x72,0x28,0x30,0x29,0x5d,0x5d,0x3b,0x0a,0x7d,
+    0x3b,0x0a,0x0a,0x66,0x72,0x61,0x67,0x6d,0x65,0x6e,0x74,0x20,0x6d,0x61,0x69,0x6e,
+    0x30,0x5f,0x6f,0x75,0x74,0x20,0x6d,0x61,0x69,0x6e,0x30,0x28,0x29,0x0a,0x7b,0x0a,
+    0x20,0x20,0x20,0x20,0x6d,0x61,0x69,0x6e,0x30,0x5f,0x6f,0x75,0x74,0x20,0x6f,0x75,
+    0x74,0x20,0x3d,0x20,0x7b,0x7d,0x3b,0x0a,0x20,0x20,0x20,0x20,0x6f,0x75,0x74,0x2e,
+    0x66,0x72,0x61,0x67,0x5f,0x63,0x6f,0x6c,0x6f,0x72,0x20,0x3d,0x20,0x66,0x6c,0x6f,
+    0x61,0x74,0x34,0x28,0x30,0x2e,0x30,0x29,0x3b,0x0a,0x20,0x20,0x20,0x20,0x72,0x65,
+    0x74,0x75,0x72,0x6e,0x20,0x6f,0x75,0x74,0x3b,0x0a,0x7d,0x0a,0x0a,0x00,
+];
+trile_shadow_shader_desc :: (backend: sg_backend) -> sg_shader_desc {
+    desc: sg_shader_desc;
+    desc.label = "trile_shadow_shader";
+    if backend == {
+    case .GLCORE;
+        desc.vertex_func.source = xx *vs_trile_shadow_source_glsl430;
+        desc.vertex_func.entry = "main";
+        desc.fragment_func.source = xx *fs_trile_shadow_source_glsl430;
+        desc.fragment_func.entry = "main";
+        desc.attrs[0].base_type = .FLOAT;
+        desc.attrs[0].glsl_name = "position";
+        desc.attrs[1].base_type = .FLOAT;
+        desc.attrs[1].glsl_name = "normal";
+        desc.attrs[2].base_type = .FLOAT;
+        desc.attrs[2].glsl_name = "centre";
+        desc.attrs[3].base_type = .FLOAT;
+        desc.attrs[3].glsl_name = "instance";
+        desc.uniform_blocks[0].stage = .VERTEX;
+        desc.uniform_blocks[0].layout = .STD140;
+        desc.uniform_blocks[0].size = 64;
+        desc.uniform_blocks[0].glsl_uniforms[0].type = .FLOAT4;
+        desc.uniform_blocks[0].glsl_uniforms[0].array_count = 4;
+        desc.uniform_blocks[0].glsl_uniforms[0].glsl_name = "trile_shadow_vs_params";
+    case .GLES3;
+        desc.vertex_func.source = xx *vs_trile_shadow_source_glsl300es;
+        desc.vertex_func.entry = "main";
+        desc.fragment_func.source = xx *fs_trile_shadow_source_glsl300es;
+        desc.fragment_func.entry = "main";
+        desc.attrs[0].base_type = .FLOAT;
+        desc.attrs[0].glsl_name = "position";
+        desc.attrs[1].base_type = .FLOAT;
+        desc.attrs[1].glsl_name = "normal";
+        desc.attrs[2].base_type = .FLOAT;
+        desc.attrs[2].glsl_name = "centre";
+        desc.attrs[3].base_type = .FLOAT;
+        desc.attrs[3].glsl_name = "instance";
+        desc.uniform_blocks[0].stage = .VERTEX;
+        desc.uniform_blocks[0].layout = .STD140;
+        desc.uniform_blocks[0].size = 64;
+        desc.uniform_blocks[0].glsl_uniforms[0].type = .FLOAT4;
+        desc.uniform_blocks[0].glsl_uniforms[0].array_count = 4;
+        desc.uniform_blocks[0].glsl_uniforms[0].glsl_name = "trile_shadow_vs_params";
+    case .METAL_MACOS;
+        desc.vertex_func.source = xx *vs_trile_shadow_source_metal_macos;
+        desc.vertex_func.entry = "main0";
+        desc.fragment_func.source = xx *fs_trile_shadow_source_metal_macos;
+        desc.fragment_func.entry = "main0";
+        desc.attrs[0].base_type = .FLOAT;
+        desc.attrs[1].base_type = .FLOAT;
+        desc.attrs[2].base_type = .FLOAT;
+        desc.attrs[3].base_type = .FLOAT;
+        desc.uniform_blocks[0].stage = .VERTEX;
+        desc.uniform_blocks[0].layout = .STD140;
+        desc.uniform_blocks[0].size = 64;
+        desc.uniform_blocks[0].msl_buffer_n = 0;
+    }
+    return desc;
+}
diff --git a/src/shaders/shader_trile_shadow.glsl b/src/shaders/shader_trile_shadow.glsl
new file mode 100644
index 0000000..b3612cd
--- /dev/null
+++ b/src/shaders/shader_trile_shadow.glsl
@@ -0,0 +1,46 @@
+@vs vs_trile_shadow
+
+layout(location=0) in vec4 position;
+layout(location=1) in vec4 normal;    // same slot as shader_trile; not used
+layout(location=2) in vec4 centre;    // same slot as shader_trile; not used
+layout(location=3) in vec4 instance;  // xyz=world_pos, w=orientation
+
+layout(binding=0) uniform trile_shadow_vs_params {
+    mat4 mvp;
+};
+
+mat3 rot_x(float a) { float c=cos(a),s=sin(a); return mat3(1,0,0, 0,c,-s, 0,s,c); }
+mat3 rot_z(float a) { float c=cos(a),s=sin(a); return mat3(c,-s,0, s,c,0, 0,0,1); }
+mat3 rot_y(float a) { float c=cos(a),s=sin(a); return mat3(c,0,s, 0,1,0, -s,0,c); }
+
+mat3 get_orientation_matrix(int ori) {
+    int face  = ori / 4;
+    int twist = ori % 4;
+    float PI  = 3.1415927;
+    mat3 base;
+    if      (face == 0) base = mat3(1.0);
+    else if (face == 1) base = rot_x(PI);
+    else if (face == 2) base = rot_z(-PI*0.5);
+    else if (face == 3) base = rot_z( PI*0.5);
+    else if (face == 4) base = rot_x( PI*0.5);
+    else                base = rot_x(-PI*0.5);
+    return base * rot_y(float(twist) * PI * 0.5);
+}
+
+void main() {
+    int ori      = int(round(instance.w));
+    mat3 rot     = get_orientation_matrix(ori);
+    vec3 local   = position.xyz - 0.5;
+    vec3 rotated = rot * local + 0.5;
+    gl_Position  = mvp * vec4(rotated + instance.xyz, 1.0);
+}
+@end
+
+@fs fs_trile_shadow
+out vec4 frag_color;
+void main() {
+    frag_color = vec4(0.0);
+}
+@end
+
+@program trile_shadow vs_trile_shadow fs_trile_shadow