diff --git a/scripts/cube_logic.lua b/scripts/cube_logic.lua
index ad3826e..c448235 100644
--- a/scripts/cube_logic.lua
+++ b/scripts/cube_logic.lua
@@ -204,6 +204,10 @@ local shader_variants = {
         vertex = "shaders/cube.vert.spv",
         fragment = "shaders/cube.frag.spv",
     },
+    solid = {
+        vertex = "shaders/solid.vert.spv",
+        fragment = "shaders/solid.frag.spv",
+    },
 }
 
 local camera = {
@@ -232,10 +236,10 @@ local last_frame_time = nil
 local movement_log_cooldown = 0.0
 local world_up = {0.0, 1.0, 0.0}
 local room = {
-    half_size = 6.0,
-    wall_thickness = 0.3,
-    wall_height = 2.5,
-    floor_half_thickness = 0.2,
+    half_size = 15.0,
+    wall_thickness = 0.5,
+    wall_height = 4.0,
+    floor_half_thickness = 0.3,
     floor_top = 0.0,
 }
 local player_state = {
@@ -250,7 +254,7 @@ local player_state = {
 
 camera.position[1] = 0.0
 camera.position[2] = room.floor_top + player_state.eye_height
-camera.position[3] = 4.0
+camera.position[3] = 10.0
 
 local function clamp(value, minValue, maxValue)
     if value < minValue then
@@ -491,15 +495,16 @@ local rotation_speed = 0.9
 local function create_spinning_cube()
     local function compute_model_matrix(time)
         local rotation = math3d.rotation_y(time * rotation_speed)
-        local position = math3d.translation(0.0, 3.4, 0.0)
-        return math3d.multiply(position, rotation)
+        local scale = scale_matrix(1.5, 1.5, 1.5)  -- Make cube 3x3x3 units
+        local position = math3d.translation(0.0, 3.0, 0.0)
+        return math3d.multiply(position, math3d.multiply(rotation, scale))
     end
 
     return {
         vertices = cube_vertices,
         indices = cube_indices,
         compute_model_matrix = compute_model_matrix,
-        shader_key = "default",
+        shader_key = "default",  -- Rainbow shader for spinning cube
     }
 end
 
@@ -533,7 +538,7 @@ local function create_static_cube(position, scale, color)
         vertices = vertices,
         indices = cube_indices,
         compute_model_matrix = compute_model_matrix,
-        shader_key = "default",
+        shader_key = "solid",  -- Use solid color shader for room objects
     }
 end
 
diff --git a/scripts/dev_commands.py b/scripts/dev_commands.py
index 6aa27f3..f6a876f 100644
--- a/scripts/dev_commands.py
+++ b/scripts/dev_commands.py
@@ -254,6 +254,61 @@ def msvc_quick(args: argparse.Namespace) -> None:
     run_argvs([cmd], args.dry_run)
 
 
+def _compile_shaders(dry_run: bool) -> None:
+    """
+    Compile GLSL shaders to SPIR-V format using glslangValidator.
+    Compiles all .vert and .frag files in the shaders directory.
+    """
+    shaders_dir = Path("shaders")
+    if not shaders_dir.exists():
+        return
+
+    # Find shader compiler
+    compiler = None
+    for cmd in ["glslangValidator", "glslc"]:
+        try:
+            result = subprocess.run([cmd, "--version"],
+                                   capture_output=True,
+                                   timeout=5)
+            if result.returncode == 0:
+                compiler = cmd
+                break
+        except (FileNotFoundError, subprocess.TimeoutExpired):
+            continue
+
+    if not compiler:
+        print("⚠️  No shader compiler found (glslangValidator or glslc)")
+        print("   Skipping shader compilation")
+        return
+
+    print("\n=== Compiling Shaders ===")
+    shader_files = list(shaders_dir.glob("*.vert")) + list(shaders_dir.glob("*.frag"))
+
+    for shader_file in shader_files:
+        output_file = shader_file.with_suffix(shader_file.suffix + ".spv")
+
+        # Check if compilation is needed
+        if output_file.exists():
+            if output_file.stat().st_mtime >= shader_file.stat().st_mtime:
+                continue  # Skip if .spv is newer than source
+
+        print(f"  Compiling {shader_file.name} -> {output_file.name}")
+
+        if not dry_run:
+            if compiler == "glslangValidator":
+                cmd = [compiler, "-V", str(shader_file), "-o", str(output_file)]
+            else:  # glslc
+                cmd = [compiler, str(shader_file), "-o", str(output_file)]
+
+            result = subprocess.run(cmd, capture_output=True, text=True)
+            if result.returncode != 0:
+                print(f"    ❌ Failed: {result.stderr}")
+            else:
+                print(f"    ✓ Success")
+
+    print("=== Shaders Compiled ===\n")
+
+
 def _sync_assets(build_dir: str, dry_run: bool) -> None:
     """
     Sync asset files (scripts, shaders, models) from the project root to the
@@ -302,13 +357,14 @@ def run_demo(args: argparse.Namespace) -> None:
     executable is `sdl3_app` (or `sdl3_app.exe` on Windows). Additional
     arguments can be passed to the executable after `--`.
 
-    By default, syncs asset files (scripts, shaders, models) before running.
-    Use --no-sync to skip asset synchronization.
+    By default, compiles shaders and syncs asset files before running.
+    Use --no-sync to skip shader compilation and asset synchronization.
     """
     build_dir = _as_build_dir(args.build_dir, DEFAULT_BUILD_DIR)
 
-    # Sync assets unless --no-sync is specified
+    # Compile shaders and sync assets unless --no-sync is specified
     if not args.no_sync:
+        _compile_shaders(args.dry_run)
         _sync_assets(build_dir, args.dry_run)
 
     exe_name = args.target or ("sdl3_app.exe" if IS_WINDOWS else "sdl3_app")
@@ -430,7 +486,7 @@ def main() -> int:
     runp.add_argument(
         "--no-sync",
         action="store_true",
-        help="skip syncing assets (scripts, shaders, models) before running",
+        help="skip shader compilation and asset syncing before running",
     )
     runp.add_argument(
         "args",
diff --git a/shaders/solid.frag b/shaders/solid.frag
new file mode 100644
index 0000000..9791877
--- /dev/null
+++ b/shaders/solid.frag
@@ -0,0 +1,10 @@
+#version 450
+
+layout(location = 0) in vec3 fragColor;
+layout(location = 1) in vec3 fragWorldPos;
+layout(location = 0) out vec4 outColor;
+
+void main() {
+    // Use vertex color directly for solid colors
+    outColor = vec4(fragColor, 1.0);
+}
diff --git a/shaders/solid.frag.spv b/shaders/solid.frag.spv
new file mode 100644
index 0000000..45f555f
Binary files /dev/null and b/shaders/solid.frag.spv differ
diff --git a/shaders/solid.vert b/shaders/solid.vert
new file mode 100644
index 0000000..39930c3
--- /dev/null
+++ b/shaders/solid.vert
@@ -0,0 +1,19 @@
+#version 450
+
+layout(location = 0) in vec3 inPos;
+layout(location = 1) in vec3 inColor;
+
+layout(location = 0) out vec3 fragColor;
+layout(location = 1) out vec3 fragWorldPos;
+
+layout(push_constant) uniform PushConstants {
+    mat4 model;
+    mat4 viewProj;
+} pushConstants;
+
+void main() {
+    fragColor = inColor;
+    vec4 worldPos = pushConstants.model * vec4(inPos, 1.0);
+    fragWorldPos = worldPos.xyz;
+    gl_Position = pushConstants.viewProj * worldPos;
+}
diff --git a/shaders/solid.vert.spv b/shaders/solid.vert.spv
new file mode 100644
index 0000000..986dc4b
Binary files /dev/null and b/shaders/solid.vert.spv differ