【详细】UnityShaderUtilities.cginc中常用的函数
UnityObjectToClipPos
输入一个模型空间中的顶点坐标 ==》输出（裁剪空间）坐标； ``` inline float4 UnityObjectToClipPosODS(float3 inPos) { float4 clipPos; float3 posWorld = mul(unity_ObjectToWorld, float4(inPos, 1.0)).xyz; #if defined(STEREO_CUBEMAP_RENDER_ON) float3 offset = ODSOffset(posWorld, unity_HalfStereoSeparation.x); clipPos = mul(UNITY_MATRIX_VP, float4(posWorld + offset, 1.0)); #else clipPos = mul(UNITY_MATRIX_VP, float4(posWorld, 1.0)); #endif return clipPos; }
// Tranforms position from object to homogenous space inline float4 UnityObjectToClipPos(in float3 pos) { #if defined(STEREO_CUBEMAP_RENDER_ON) return UnityObjectToClipPosODS(pos); #else // More efficient than computing M*VP matrix product return mul(UNITY_MATRIX_VP, mul(unity_ObjectToWorld, float4(pos, 1.0))); #endif }
inline float4 UnityObjectToClipPos(float4 pos) // overload for float4; avoids “implicit truncation” warning for existing shaders { return UnityObjectToClipPos(pos.xyz); } ```
