private void UpdateParameters()
{
// update raytracing scene, in case something moved
_rtas.Update();
// frustum corners for current camera transform
Vector3 bottomLeft = _camera.ViewportToWorldPoint(new Vector3(0, 0, _camera.farClipPlane)).normalized;
Vector3 topLeft = _camera.ViewportToWorldPoint(new Vector3(0, 1, _camera.farClipPlane)).normalized;
Vector3 bottomRight = _camera.ViewportToWorldPoint(new Vector3(1, 0, _camera.farClipPlane)).normalized;
Vector3 topRight = _camera.ViewportToWorldPoint(new Vector3(1, 1, _camera.farClipPlane)).normalized;
// update camera, environment parameters
_rayTracingShader.SetVector("_SkyColor", SkyColor.gamma);
_rayTracingShader.SetVector("_GroundColor", GroundColor.gamma);
_rayTracingShader.SetVector("_TopLeftFrustumDir", topLeft);
_rayTracingShader.SetVector("_TopRightFrustumDir", topRight);
_rayTracingShader.SetVector("_BottomLeftFrustumDir", bottomLeft);
_rayTracingShader.SetVector("_BottomRightFrustumDir", bottomRight);
_rayTracingShader.SetVector("_CameraPos", _camera.transform.position);
_cameraWorldMatrix = _camera.transform.localToWorldMatrix;
// reset accumulation frame counter
_frameIndex = 0;
}
private void OnRenderImage(RenderTexture source, RenderTexture destination)
{
CheckNulls();
CheckRenderTexture();
SetShaderProperties();
_RTAS.Update();
shader.Dispatch("RayGen", cam.pixelWidth / (int)resolution, cam.pixelHeight / (int)resolution, 1, cam);
Graphics.Blit(source, destination);
}
void Reset()
{
_AccelerationStructure.Update();
PathTracingShader.SetVector("_AmbientColor", AmbientColor.gamma);
Matrix4x4 frustum = Matrix4x4.identity;
frustum.SetRow(0, _Camera.ViewportToWorldPoint(new Vector3(0, 1, _Camera.farClipPlane)).normalized);
frustum.SetRow(1, _Camera.ViewportToWorldPoint(new Vector3(1, 1, _Camera.farClipPlane)).normalized);
frustum.SetRow(2, _Camera.ViewportToWorldPoint(new Vector3(0, 0, _Camera.farClipPlane)).normalized);
frustum.SetRow(3, _Camera.ViewportToWorldPoint(new Vector3(1, 0, _Camera.farClipPlane)).normalized);
PathTracingShader.SetMatrix("_Frustum", frustum);
PathTracingShader.SetVector("_WorldSpaceCameraPos", _Camera.transform.position);
_ModelMatrix = _Camera.transform.localToWorldMatrix;
_Frame = 0;
}