/// <inheritdoc /> public unsafe override void BuildUVCoordinates(ParticleVertexBuilder vertexBuilder, ParticleSorter sorter, AttributeDescription texCoordsDescription) { var lifeField = sorter.GetField(ParticleFields.RemainingLife); if (!lifeField.IsValid()) { return; } var texAttribute = vertexBuilder.GetAccessor(texCoordsDescription); if (texAttribute.Size == 0 && texAttribute.Offset == 0) { return; } var texDefault = vertexBuilder.GetAccessor(vertexBuilder.DefaultTexCoords); if (texDefault.Size == 0 && texDefault.Offset == 0) { return; } foreach (var particle in sorter) { var normalizedTimeline = 1f - *(float *)(particle[lifeField]);; uvTransform = Vector4.Lerp(StartFrame, EndFrame, normalizedTimeline); uvTransform.Z -= uvTransform.X; uvTransform.W -= uvTransform.Y; vertexBuilder.TransformAttributePerSegment(texDefault, texAttribute, this); vertexBuilder.NextSegment(); } vertexBuilder.RestartBuffer(); }