IVRSystem::ComputeDistortion

bool ComputeDistortion( Hmd_Eye eEye, float fU, float fV, DistortionCoordinates_t *pDistortionCoordinates )

Gets the result of a single distortion value for use in a distortion map. Input UVs are in a single eye's viewport, and output UVs are for the source render target in the distortion shader.

Returns true for success. False indicates values are unsuitable.

• eEye - Eye_Left or Eye_Right. Determines which eye the function should return the distortion value for.
• fU - horizontal texture coordinate for the output pixel within the viewport
• fV - vertical texture coordinate for the output pixel within the viewport
• DistortionCoordinates_t *pDistortionCoordinates - The struct to be updated with the distortion values

ComputeDistortion returns distortion values using the following structure: struct DistortionCoordinates_t { float rfRed[2]; float rfGreen[2]; float rfBlue[2]; };

rfRed contains the UVs for the red channel, rfGreen contains the UVs for the green channel, and rfBlue contains the UVs for the blue channel.