Class AccelerationStructureTriangles

Acceleration structure triangle geometry.

Inheritance
object
AccelerationStructureGeometry
AccelerationStructureTriangles
Inherited Members
Namespace: Evergine.Common.Graphics.Raytracing
Assembly: Evergine.Common.dll
Syntax
public class AccelerationStructureTriangles : AccelerationStructureGeometry

Fields

IndexBuffer

Array of vertex indices. If null, triangles are non-indexed. As with graphics, the address must be aligned to the size of IndexFormat.

Declaration
public Buffer IndexBuffer
Field Value
Type Description
Buffer

IndexCount

Number of indices in the IndexBuffer. Must be 0 if IndexBuffer is null.

Declaration
public uint IndexCount
Field Value
Type Description
uint

IndexFormat

Format of the indices in the IndexBuffer. Must be one of the following: DXGI_FORMAT_UNKNOWN - when IndexBuffer is null DXGI_FORMAT_R32_UINT DXGI_FORMAT_R16_UINT.

Declaration
public IndexFormat IndexFormat
Field Value
Type Description
IndexFormat

IndexOffset

Index offset in bytes.

Declaration
public uint IndexOffset
Field Value
Type Description
uint

VertexBuffer

Array of vertices including a stride. The alignment on the address and stride must be a multiple of the component size, so 4 bytes for formats with 32-bit components and 2 bytes for formats with 16-bit components. Unlike graphics, there is no constraint on the stride, other than that the bottom 32 bits of the value are all that are used – the field is UINT64 purely to make neighboring fields align cleanly/obviously everywhere. Each vertex position is expected to be at the start address of the stride range, and any excess space is ignored by acceleration structure builds. This excess space might contain other app data such as vertex attributes, which the app is responsible for manually fetching in shaders, whether it is interleaved in vertex buffers or elsewhere. The memory pointed to must be in the state D3D12_RESOURCE_STATE_NON_PIXEL_SHADER_RESOURCE. Note that if an app wants to share vertex buffer inputs between graphics input assembler and raytracing acceleration structure build input, it can always put a resource into a combination of read states simultaneously, e.g., D3D12_RESOURCE_STATE_VERTEX_AND_CONSTANT_BUFFER | D3D12_RESOURCE_STATE_NON_PIXEL_SHADER_RESOURCE.

Declaration
public Buffer VertexBuffer
Field Value
Type Description
Buffer

VertexCount

Number of vertices in the VertexBuffer.

Declaration
public uint VertexCount
Field Value
Type Description
uint

VertexFormat

Format of the vertices in VertexBuffer. Must be one of the following: DXGI_FORMAT_R32G32_FLOAT - the third component is assumed to be 0 DXGI_FORMAT_R32G32B32_FLOAT DXGI_FORMAT_R16G16_FLOAT - the third component is assumed to be 0 DXGI_FORMAT_R16G16B16A16_FLOAT - the A16 component is ignored; other data can be packed there, such as by setting the vertex stride to 6 bytes. DXGI_FORMAT_R16G16_SNORM - the third component is assumed to be 0 DXGI_FORMAT_R16G16B16A16_SNORM - the A16 component is ignored; other data can be packed there, such as by setting the vertex stride to 6 bytes.

Declaration
public PixelFormat VertexFormat
Field Value
Type Description
PixelFormat

VertexOffset

Vertex offset in bytes.

Declaration
public uint VertexOffset
Field Value
Type Description
uint

VertexStride

The vertex stride.

Declaration
public uint VertexStride
Field Value
Type Description
uint

Extension Methods