Version: Unity 6 Preview (6000.0)
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RayTracingGeometryInstanceConfig.indexCount

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public int indexCount;

Description

The amount of indices from indexBuffer that defines this ray tracing geometry instance.

Use -1 to instruct Unity to use all the indices from indexBuffer when building the acceleration structure associated with the ray tracing instance. If the value is positive, it must be a multiple of 3 and together with indexStart it must define a valid range into indexBuffer.