geometryDescriptors
An array that contains the individual pieces of geometry that compose the acceleration structure.
Declaration
var geometryDescriptors: [MTLAccelerationStructureGeometryDescriptor]? { get set }Discussion
The value of the motionKeyframeCount property determines what kinds of geometry descriptors you can assign to this property and how you need to configure them.
If the value of motionKeyframeCount is greater than 1, then the geometry descriptors need to be either MTLAccelerationStructureMotionBoundingBoxGeometryDescriptor or MTLAccelerationStructureMotionTriangleGeometryDescriptor objects. Further, you need to provide exactly that many keyframes of data when creating those geometry descriptors. If motionKeyframeCount is 1, use MTLAccelerationStructureBoundingBoxGeometryDescriptor or MTLAccelerationStructureTriangleGeometryDescriptor objects instead.