C Specification

Possible values of flags in the instance modifying the behavior of that instance are:,

typedef enum VkGeometryInstanceFlagBitsNV {
    VK_GEOMETRY_INSTANCE_TRIANGLE_CULL_DISABLE_BIT_NV = 0x00000001,
    VK_GEOMETRY_INSTANCE_TRIANGLE_FRONT_COUNTERCLOCKWISE_BIT_NV = 0x00000002,
    VK_GEOMETRY_INSTANCE_FORCE_OPAQUE_BIT_NV = 0x00000004,
    VK_GEOMETRY_INSTANCE_FORCE_NO_OPAQUE_BIT_NV = 0x00000008,
    VK_GEOMETRY_INSTANCE_FLAG_BITS_MAX_ENUM_NV = 0x7FFFFFFF
} VkGeometryInstanceFlagBitsNV;

Description

  • VK_GEOMETRY_INSTANCE_TRIANGLE_CULL_DISABLE_BIT_NV disables face culling for this instance.

  • VK_GEOMETRY_INSTANCE_TRIANGLE_FRONT_COUNTERCLOCKWISE_BIT_NV indicates that the front face of the triangle for culling purposes is the face that is counter clockwise in object space relative to the ray origin. Because the facing is determined in object space, an instance transform matrix does not change the winding, but a geometry transform does.

  • VK_GEOMETRY_INSTANCE_FORCE_OPAQUE_BIT_NV causes this instance to act as though VK_GEOMETRY_OPAQUE_BIT_NV were specified on all geometries referenced by this instance. This behavior can be overridden by the ray flag gl_RayFlagsNoOpaqueNV.

  • VK_GEOMETRY_INSTANCE_FORCE_NO_OPAQUE_BIT_NV causes this instance to act as though VK_GEOMETRY_OPAQUE_BIT_NV were not specified on all geometries referenced by this instance. This behavior can be overridden by the ray flag gl_RayFlagsOpaqueNV.

VK_GEOMETRY_INSTANCE_FORCE_NO_OPAQUE_BIT_NV and VK_GEOMETRY_INSTANCE_FORCE_OPAQUE_BIT_NV must not be used in the same flag.

See Also

Document Notes

For more information, see the Vulkan Specification

This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.

Copyright (c) 2014-2019 Khronos Group. This work is licensed under a Creative Commons Attribution 4.0 International License.