private void Start()
{
Debug.Log("Raytracing support: " + SystemInfo.supportsRayTracing);
_camera = GetComponent <Camera>();
_dxrTarget = new RenderTexture(_camera.pixelWidth, _camera.pixelHeight, 0, RenderTextureFormat.ARGBFloat, RenderTextureReadWrite.Default);
_dxrTarget.enableRandomWrite = true;
_dxrTarget.Create();
_accumulationTarget1 = new RenderTexture(_dxrTarget);
_accumulationTarget2 = new RenderTexture(_dxrTarget);
// build scene for raytracing
InitRaytracingAccelerationStructure();
_rayTracingShader = Resources.Load <RayTracingShader>("RayTracingShader");
_rayTracingShader.SetAccelerationStructure("_RaytracingAccelerationStructure", _rtas);
_rayTracingShader.SetTexture("_DxrTarget", _dxrTarget);
// set shader pass name that will be used during raytracing
_rayTracingShader.SetShaderPass("DxrPass");
// update raytracing parameters
UpdateParameters();
_accumulationMaterial = new Material(Shader.Find("Hidden/Accumulation"));
}
void Start()
{
if (!SystemInfo.supportsRayTracing)
{
Debug.Log("Ray Tracing not supported !");
}
_Camera = GetComponent <Camera>();
_RenderTarget0 = new RenderTexture(_Camera.pixelWidth, _Camera.pixelHeight, 0, RenderTextureFormat.ARGBFloat);
_RenderTarget0.enableRandomWrite = true;
_RenderTarget0.Create();
_RenderTarget1 = new RenderTexture(_RenderTarget0);
_RenderTarget2 = new RenderTexture(_RenderTarget0);
RayTracingAccelerationStructure.RASSettings settings = new RayTracingAccelerationStructure.RASSettings();
settings.layerMask = ~0;
settings.managementMode = RayTracingAccelerationStructure.ManagementMode.Automatic;
settings.rayTracingModeMask = RayTracingAccelerationStructure.RayTracingModeMask.Everything;
_AccelerationStructure = new RayTracingAccelerationStructure(settings);
Renderer[] renderers = FindObjectsOfType <Renderer>();
for (int i = 0; i < renderers.Length; i++)
{
Material[] materials = renderers[i].sharedMaterials;
for (int j = 0; j < materials.Length; j++)
{
materials[j] = new Material(IndirectDiffuseShader);
}
renderers[i].sharedMaterials = materials;
_AccelerationStructure.AddInstance(renderers[i]);
}
_AccelerationStructure.Build();
PathTracingShader.SetAccelerationStructure("_AccelerationStructure", _AccelerationStructure);
PathTracingShader.SetTexture("_RenderTarget", _RenderTarget0);
PathTracingShader.SetShaderPass("PathTracingRTX");
_Material = new Material(ProgressiveShader);
Reset();
}
void OnRenderImage(RenderTexture src, RenderTexture dest)
{
if (!SystemInfo.supportsRayTracing || !rayTracingShader)
{
Debug.Log("The RayTracing API is not supported by this GPU or by the current graphics API.");
Graphics.Blit(src, dest);
return;
}
if (rayTracingAccelerationStructure == null)
{
return;
}
if (prevCameraMatrix != Camera.main.cameraToWorldMatrix)
{
convergenceStep = 0;
}
if (prevBounceCountOpaque != bounceCountOpaque)
{
convergenceStep = 0;
}
if (prevBounceCountTransparent != bounceCountTransparent)
{
convergenceStep = 0;
}
// Not really needed per frame if the scene is static.
rayTracingAccelerationStructure.Build();
rayTracingShader.SetShaderPass("PathTracing");
Shader.SetGlobalInt(Shader.PropertyToID("g_BounceCountOpaque"), (int)bounceCountOpaque);
Shader.SetGlobalInt(Shader.PropertyToID("g_BounceCountTransparent"), (int)bounceCountTransparent);
// Input
rayTracingShader.SetAccelerationStructure(Shader.PropertyToID("g_AccelStruct"), rayTracingAccelerationStructure);
rayTracingShader.SetFloat(Shader.PropertyToID("g_Zoom"), Mathf.Tan(Mathf.Deg2Rad * Camera.main.fieldOfView * 0.5f));
rayTracingShader.SetFloat(Shader.PropertyToID("g_AspectRatio"), cameraWidth / (float)cameraHeight);
rayTracingShader.SetInt(Shader.PropertyToID("g_ConvergenceStep"), convergenceStep);
rayTracingShader.SetInt(Shader.PropertyToID("g_FrameIndex"), Time.frameCount);
rayTracingShader.SetTexture(Shader.PropertyToID("g_EnvTex"), envTexture);
// Output
rayTracingShader.SetTexture(Shader.PropertyToID("g_Radiance"), rayTracingOutput);
rayTracingShader.Dispatch("MainRayGenShader", (int)cameraWidth, (int)cameraHeight, 1, Camera.main);
Graphics.Blit(rayTracingOutput, dest);
convergenceStep++;
prevCameraMatrix = Camera.main.cameraToWorldMatrix;
prevBounceCountOpaque = bounceCountOpaque;
prevBounceCountTransparent = bounceCountTransparent;
}
void SetShaderProperties()
{
Vector3 bottomLeft = cam.ViewportToWorldPoint(new Vector3(0, 0, 100000)).normalized;
Vector3 topLeft = cam.ViewportToWorldPoint(new Vector3(0, 1, 100000)).normalized;
Vector3 bottomRight = cam.ViewportToWorldPoint(new Vector3(1, 0, 100000)).normalized;
Vector3 topRight = cam.ViewportToWorldPoint(new Vector3(1, 1, 100000)).normalized;
shader.SetVector("_TopLeftFrustumDir", topLeft);
shader.SetVector("_TopRightFrustumDir", topRight);
shader.SetVector("_BottomLeftFrustumDir", bottomLeft);
shader.SetVector("_BottomRightFrustumDir", bottomRight);
shader.SetVector("_Sun", sun.transform.forward);
shader.SetVector("_WSCP", transform.position);
shader.SetFloat("_RayLength", rayLength);
combine.SetTexture("_CS", cs);
shader.SetAccelerationStructure("_RTAS", _RTAS);
combine.SetColor("_Ambient", RenderSettings.ambientLight);
}
/// <summary>
/// Ray tracing to check whether plane1 can see plane2 by GPU.
/// </summary>
/// <param name="plane1">the plane1.</param>
/// <param name="plane2">the plane2.</param>
/// <returns>the result.</returns>
public bool RayTracingPlane2PlaneGPU(Plane plane1, Plane plane2)
{
var viewRect = new Rect(0F, 0F, math.ceil(plane1.size.x / rayTracingStep.x), math.ceil(plane1.size.y / rayTracingStep.x));
var renderTarget = RequireRenderTarget(ref viewRect);
var resultBuffer = RequireResultBuffer();
bakeRayTraceShader.SetShaderPass("PVS");
bakeRayTraceShader.SetAccelerationStructure(_accelerationStructureShaderId, accelerationStructure);
bakeRayTraceShader.SetTexture(_resultShaderId, renderTarget);
bakeRayTraceShader.SetVector(_viewLeftBottomCornerShaderId, plane1.leftBottomCorner);
bakeRayTraceShader.SetVector(_viewRightDirShaderId, plane1.rightDir);
bakeRayTraceShader.SetVector(_viewUpDirShaderId, plane1.upDir);
bakeRayTraceShader.SetVector(_viewSizeShaderId, plane1.size);
bakeRayTraceShader.SetVector(_targetLeftBottomCornerShaderId, plane2.leftBottomCorner);
bakeRayTraceShader.SetVector(_targetRightDirShaderId, plane2.rightDir);
bakeRayTraceShader.SetVector(_targetUpDirShaderId, plane2.upDir);
bakeRayTraceShader.SetVector(_targetSizeShaderId, plane2.size);
bakeRayTraceShader.SetVector(_rayTracingStepShaderId, rayTracingStep);
bakeRayTraceShader.Dispatch("BakeRaygenShader", (int)viewRect.width, (int)viewRect.height, 1);
var data = new byte[]
{
0, 0, 0, 0
};
resultBuffer.SetData(data);
var kernelId = countPixelComputeShader.FindKernel("CSMain");
countPixelComputeShader.SetTexture(kernelId, _pixelsShaderId, renderTarget);
countPixelComputeShader.SetInt(_widthShaderId, (int)viewRect.width);
countPixelComputeShader.SetInt(_heightShaderId, (int)viewRect.height);
countPixelComputeShader.SetBuffer(kernelId, _resultShaderId, resultBuffer);
countPixelComputeShader.GetKernelThreadGroupSizes(kernelId, out var grpSizeX, out var grpSizeY, out var _);
countPixelComputeShader.Dispatch(kernelId, (int)math.ceil(viewRect.width / grpSizeX), (int)math.ceil(viewRect.height / grpSizeY), 1);
resultBuffer.GetData(data);
return(data[0] > 0);
}
public void OnRenderImage(RenderTexture src, RenderTexture dest)
{
var cam = Camera.main;
if (!CheckResources(cam))
{
Graphics.Blit(src, dest);
return;
}
//-- shader pass "RTPass" in material shaders
rtShader.SetShaderPass("RTPass");
//- set global variables, used in all material shaders
Shader.SetGlobalVector(ShaderID._T_minmax, new Vector2(tMin, tMax));
//-- set local RT raygen shader variables
_rtAccStructure.Build();
rtShader.SetAccelerationStructure(ShaderID._SceneAccelerationStructure, _rtAccStructure);
rtShader.SetTexture(ShaderID._RenderTarget, _rtTargetTexture);
rtShader.SetMatrix(ShaderID._InvViewMatrix, cam.cameraToWorldMatrix);
rtShader.SetTexture(ShaderID._EnvironmentTex, environmentCubemap);
rtShader.SetFloat(ShaderID._EnvironmentGamma, Mathf.GammaToLinearSpace(environmentExposure));
rtShader.SetFloat(ShaderID._ShadowBrightness, shadowBrightness);
var camOrigin = cam.transform.position;
var frustumBottomLeftDirWS = (cam.ViewportToWorldPoint(new Vector3(0, 0, cam.nearClipPlane)) - camOrigin).normalized;
var frustumBottomRightDirWS = (cam.ViewportToWorldPoint(new Vector3(1, 0, cam.nearClipPlane)) - camOrigin).normalized;
var frustumTopLeftDirWS = (cam.ViewportToWorldPoint(new Vector3(0, 1, cam.nearClipPlane)) - camOrigin).normalized;
rtShader.SetVector(ShaderID._FrustumBottomLeftDirWS, frustumBottomLeftDirWS);
rtShader.SetVector(ShaderID._FrustumHorizDirWS, frustumBottomRightDirWS - frustumBottomLeftDirWS);
rtShader.SetVector(ShaderID._FrustumVertDirWS, frustumTopLeftDirWS - frustumBottomLeftDirWS);
//-- dispatch ray tracing
rtShader.Dispatch("RaygenShader", cam.pixelWidth, cam.pixelHeight, 1);
Graphics.Blit(_rtTargetTexture, dest);
}
