Root cause: ALL 12 faces in cube.obj had reversed winding order.
This caused every face normal to point inward, breaking:
- Diffuse lighting (NdotL < 0 → no light on any face)
- Shadow bias (slope-dependent bias used wrong NdotL)
- Shadow self-shadowing (both sides rendered with CULL_NONE)
Fix: reversed all face indices to correct CCW winding:
- Back face: f 1 4 3, f 1 3 2 (was f 1 2 3, f 1 3 4)
- Front face: f 5 6 7, f 5 7 8 (was f 5 7 6, f 5 8 7)
- Left/Right/Bottom/Top: all reversed
Now MeshMath.ComputeFaceNormal produces correct outward normals.
Normal flip in shader (dot(N,V) < 0) is still kept as safety for
double-sided rendering, but cubes now have correct normals natively.
- Add get_world_state AI command that dumps ECS entities with Transform,
Camera, Material, Light, and Mesh summaries.
- Add set_material AI command to update albedo/roughness/metallic/texture.
- Expose both commands as MCP HTTP tools and stdio tools.
- Add Light component and support up to 4 directional lights via a Vulkan
uniform buffer (descriptor set 0) with std140 layout.
- Move per-frame lighting/camera data into the uniform buffer; push constants
now carry only MVP + material properties (96 bytes).
- Add Texture class for PNG loading and Vulkan image/view/sampler creation.
- Add per-entity combined image sampler descriptor set (set 1) and use it
for albedo texture sampling in the fragment shader.
- Generate a checkerboard floor texture in Program.cs.
- Add McpStdioServer for headless stdio MCP (Claude Desktop compatible).
- Add claude_desktop_config.json and scripts/start_mcp_engine.sh.
- Update CORTEX_ENGINE_ARCHITECTURE.md with runtime notes, CLI arguments,
Vulkan pipeline details, and MCP client configuration.
- All configs (Debug/Release/ReleaseAOT) build successfully.
- Add Vertex struct and Mesh ECS component (vertices + indices).
- Add Vulkan IndexBuffer for indexed draws.
- Add MeshRenderer that draws Mesh + Transform entities with vkCmdDrawIndexed.
- Add minimal .obj loader (positions, faces) and glTF/glTF-binary loader via SharpGLTF.Core.
- Rewrite shaders to 3D position + color; recompile to SPIR-V.
- Update VulkanPipeline for new vertex format.
- Ship a sample Content/cube.obj and wire Program.cs to load it.
- Remove TriangleRenderer (replaced by MeshRenderer).
emil28092005