Mapgen4-3: unity shader 获得相机朝向

shader里面相机朝向

• 视图空间 到 世界空间 unity_CameraToWorld
  • 前朝向

    float3 forward = mul(unity_CameraToWorld, float4(0,0,1,1)).xyz;

  • 右朝向

    float3 forward = mul(unity_CameraToWorld, float4(1,0,0,1)).xyz;

  • 上朝向

    float3 forward = mul(unity_CameraToWorld, float4(0,1,0,1)).xyz;

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• 视图空间 到 本地空间 UNITY_MATRIX_IT_MV
  • 前朝向

    float3 forward = mul(UNITY_MATRIX_IT_MV, float4(0,0,1,1)).xyz;

  • 右朝向

    float3 forward = mul(UNITY_MATRIX_IT_MV, float4(1,0,0,1)).xyz;

  • 上朝向

    float3 forward = mul(UNITY_MATRIX_IT_MV, float4(0,1,0,1)).xyz;