C Specification
Possible values of flags
in the instance modifying the behavior of
that instance are:
// Provided by VK_KHR_acceleration_structure
typedef enum VkGeometryInstanceFlagBitsKHR {
VK_GEOMETRY_INSTANCE_TRIANGLE_FACING_CULL_DISABLE_BIT_KHR = 0x00000001,
VK_GEOMETRY_INSTANCE_TRIANGLE_FLIP_FACING_BIT_KHR = 0x00000002,
VK_GEOMETRY_INSTANCE_FORCE_OPAQUE_BIT_KHR = 0x00000004,
VK_GEOMETRY_INSTANCE_FORCE_NO_OPAQUE_BIT_KHR = 0x00000008,
// Provided by VK_EXT_opacity_micromap
VK_GEOMETRY_INSTANCE_FORCE_OPACITY_MICROMAP_2_STATE_EXT = 0x00000010,
// Provided by VK_EXT_opacity_micromap
VK_GEOMETRY_INSTANCE_DISABLE_OPACITY_MICROMAPS_EXT = 0x00000020,
VK_GEOMETRY_INSTANCE_TRIANGLE_FRONT_COUNTERCLOCKWISE_BIT_KHR = VK_GEOMETRY_INSTANCE_TRIANGLE_FLIP_FACING_BIT_KHR,
// Provided by VK_NV_ray_tracing
VK_GEOMETRY_INSTANCE_TRIANGLE_CULL_DISABLE_BIT_NV = VK_GEOMETRY_INSTANCE_TRIANGLE_FACING_CULL_DISABLE_BIT_KHR,
// Provided by VK_NV_ray_tracing
VK_GEOMETRY_INSTANCE_TRIANGLE_FRONT_COUNTERCLOCKWISE_BIT_NV = VK_GEOMETRY_INSTANCE_TRIANGLE_FRONT_COUNTERCLOCKWISE_BIT_KHR,
// Provided by VK_NV_ray_tracing
VK_GEOMETRY_INSTANCE_FORCE_OPAQUE_BIT_NV = VK_GEOMETRY_INSTANCE_FORCE_OPAQUE_BIT_KHR,
// Provided by VK_NV_ray_tracing
VK_GEOMETRY_INSTANCE_FORCE_NO_OPAQUE_BIT_NV = VK_GEOMETRY_INSTANCE_FORCE_NO_OPAQUE_BIT_KHR,
} VkGeometryInstanceFlagBitsKHR;
or the equivalent
// Provided by VK_NV_ray_tracing
typedef VkGeometryInstanceFlagBitsKHR VkGeometryInstanceFlagBitsNV;
Description
-
VK_GEOMETRY_INSTANCE_TRIANGLE_FACING_CULL_DISABLE_BIT_KHR
disables face culling for this instance. -
VK_GEOMETRY_INSTANCE_TRIANGLE_FLIP_FACING_BIT_KHR
indicates that the facing determination for geometry in this instance is inverted. Because the facing is determined in object space, an instance transform does not change the winding, but a geometry transform does. -
VK_GEOMETRY_INSTANCE_FORCE_OPAQUE_BIT_KHR
causes this instance to act as thoughVK_GEOMETRY_OPAQUE_BIT_KHR
were specified on all geometries referenced by this instance. This behavior can be overridden by the SPIR-VNoOpaqueKHR
ray flag. -
VK_GEOMETRY_INSTANCE_FORCE_NO_OPAQUE_BIT_KHR
causes this instance to act as thoughVK_GEOMETRY_OPAQUE_BIT_KHR
were not specified on all geometries referenced by this instance. This behavior can be overridden by the SPIR-VOpaqueKHR
ray flag.
VK_GEOMETRY_INSTANCE_FORCE_NO_OPAQUE_BIT_KHR
and
VK_GEOMETRY_INSTANCE_FORCE_OPAQUE_BIT_KHR
must not be used in the
same flag.
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.