/** a single vertex in a render model */
struct RenderModel_Vertex_t
{
	HmdVector3_t vPosition;		// position in meters in device space
	HmdVector3_t vNormal;		
	float rfTextureCoord[ 2 ];
};
/** A texture map for use on a render model */
struct RenderModel_TextureMap_t
{
	uint16_t unWidth, unHeight; // width and height of the texture map in pixels
	const uint8_t *rubTextureMapData;	// Map texture data. All textures are RGBA with 8 bits per channel per pixel. Data size is width * height * 4ub
};
/** Contains everything a game needs to render a single tracked or static object for the user. */
struct RenderModel_t
{
	uint64_t ulInternalHandle;					// Used internally by SteamVR
	const RenderModel_Vertex_t *rVertexData;			// Vertex data for the mesh
	uint32_t unVertexCount;						// Number of vertices in the vertex data
	const uint16_t *rIndexData;						// Indices into the vertex data for each triangle
	uint32_t unTriangleCount;					// Number of triangles in the mesh. Index count is 3 * TriangleCount
	RenderModel_TextureMap_t diffuseTexture;	// RGBA diffuse texture for the model
};