Sample a varying at the location of a specified sample.
||-||Specifies the interpolant to be sampled at the location of sample |
||-||Specifies the index of the sample whose location will be used to sample |
interpolateAtSample returns the value of the input varying
interpolant sampled at the location of sample number
sample . If multisample buffers are not available, the input varying will be evaluated at the center of the pixel. If sample
sample does not exist, the position used to interpolate the input varying is undefined.
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