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System values are retrieved by using special intrinsic functions, rather than including parameters with special semantics in your shader function signature.
In this section
Ray dispatch system values
| Topic | Description |
|---|---|
| DispatchRaysIndex | Gets the current x and y ___location within the width and height obtained with the DispatchRaysDimensions system value intrinsic. |
| DispatchRaysDimensions | The width, height and depth values from the D3D12_DISPATCH_RAYS_DESC structure specified in the originating DispatchRays call. |
Ray system values
| Topic | Description |
|---|---|
| WorldRayOrigin | The world-space origin of the current ray. |
| WorldRayDirection | The world-space direction for the current ray. |
| RayTMin | A float representing the current parametric starting point for the ray. |
| RayTCurrent | A float representing the current parametric ending point for the ray. |
| RayFlags | An unsigned integer containing the current ray_flag flags. |
Primitive/object space system values
| Topic | Description |
|---|---|
| InstanceIndex | The autogenerated index of the current instance in the top-level raytracing acceleration structure. |
| InstanceID | The user-provided identifier for the instance on the bottom-level acceleration structure instance within the top-level structure. |
| PrimitiveIndex | The autogenerated index of the primitive within the geometry inside the bottom-level acceleration structure instance. |
| ObjectRayOrigin | The object-space origin for the current ray. |
| ObjectRayDirection | The object-space direction for the current ray. |
| ObjectToWorld3x4 | A matrix for transforming from object-space to world-space. |
| ObjectToWorld4x3 | A matrix for transforming from object-space to world-space. |
| WorldToObject3x4 | A matrix for transforming from world-space to object-space |
| WorldToObject4x3 | A matrix for transforming from world-space to object-space |
Hit-specific system values
| Topic | Description |
|---|---|
| HitKind | Returns the value passed as the HitKind parameter to ReportHit. |