PunctualLightData

Remarks

Eighty bytes with no padding anywhere, and that is the whole reason the field order is what it is: each float3 is followed by a float, so every member lands on its natural std140 sixteen-byte boundary. Reordered so that two vectors are adjacent, the same values cost far more and every offset moves.

Because it matches, an upload is a blit. Writing this array to a buffer is one MemoryMarshal.AsBytes and no per-field packing — which is the only reason a per-object light list is affordable at all. A test asserts the size and the offsets rather than trusting the comment, because the failure is silent: the shader reads whatever bytes are there and shades with them.

Fields and properties (12)

• public Vector3 Position

  Where the light is.

• public float Kind

  Which LightKind it is, as a float.

• public Vector3 Colour

  Its radiance — colour already multiplied by intensity.

• public float Range

  Where its contribution reaches zero.

• public Vector3 Direction

  Which way it points.

• public float CosInner

  The cosine of the inner cone half-angle.

• public float Radius

  Its sphere radius.

• public float CosOuter

  The cosine of the outer cone half-angle.

• public float ShadowIndex

  Which tile of the punctual shadow atlas shadows it, or −1 for none.

• public float Padding

  One float of tail padding the shader declares and never reads.

• public Vector3 Tangent

  A shaped light's axis: along a tube, or across a rectangle's width.

• public float HalfLength

  Half a tube's length, or half a rectangle's width.

Used by (8)

• BufferTransferDeviceTestsVixen.Graphics.Golden.Tests
• ClusterCullingDeviceTestsVixen.Graphics.Golden.Tests
• ClusteredShadingDeviceTestsVixen.Graphics.Golden.Tests
• ForwardLightingRenderFeatureVixen.Rendering
• ForwardLightingTestsVixen.Rendering.Tests
• IrradianceBounceDeviceTestsVixen.Graphics.Golden.Tests
• IrradianceShadingDeviceTestsVixen.Graphics.Golden.Tests
• RenderLightVixen.Rendering