MTLStepFunction.perVertex The vertex function fetches data for every vertex. Declarationcase perVertex See AlsoStep optionsMTLStepFunction.constantMTLStepFunction.perInstanceMTLStepFunction.perPatchMTLStepFunction.perPatchControlPointMTLStepFunction.threadPositionInGridXMTLStepFunction.threadPositionInGridYMTLStepFunction.threadPositionInGridXIndexedMTLStepFunction.threadPositionInGridYIndexed