public static float Evaluate(ref VolumeFalloffEngineData falloff, ref OrientedBBox obb, float3 positionWS, float distanceWS)
{
float3x3 obbFrame = new float3x3(obb.right, obb.up, math.cross(obb.up, obb.right));
float3 obbExtents = new float3(obb.extentX, obb.extentY, obb.extentZ);
float3 samplePositionBS = math.mul(obbFrame, positionWS - obb.center);
float3 samplePositionBCS = samplePositionBS / obbExtents;
bool isInsideVolume = math.max(math.abs(samplePositionBCS.x), math.max(math.abs(samplePositionBCS.y), math.abs(samplePositionBCS.z))) < 1.0f;
if (!isInsideVolume)
{
return(0.0f);
}
float3 samplePositionBNDC = samplePositionBCS * 0.5f + 0.5f;
float volumeWeight = VolumeFalloff.ComputeVolumeFalloffWeight(
samplePositionBNDC,
distanceWS,
falloff.rcpFaceFadePos,
falloff.rcpFaceFadeNeg,
falloff.rcpDistFadeLen,
falloff.endTimesRcpDistFadeLen
);
volumeWeight *= falloff.weight;
return(volumeWeight);
}
public DensityVolumeList PrepareVisibleDensityVolumeList(HDCamera camera, CommandBuffer cmd)
{
DensityVolumeList densityVolumes = new DensityVolumeList();
if (preset == VolumetricLightingPreset.Off)
{
return(densityVolumes);
}
using (new ProfilingSample(cmd, "Prepare Visible Density Volume List"))
{
Vector3 camPosition = camera.camera.transform.position;
Vector3 camOffset = Vector3.zero; // World-origin-relative
if (ShaderConfig.s_CameraRelativeRendering != 0)
{
camOffset = camPosition; // Camera-relative
}
m_VisibleVolumeBounds.Clear();
m_VisibleVolumeProperties.Clear();
// Collect all visible finite volume data, and upload it to the GPU.
HomogeneousDensityVolume[] volumes = Object.FindObjectsOfType(typeof(HomogeneousDensityVolume)) as HomogeneousDensityVolume[];
for (int i = 0; i < Math.Min(volumes.Length, k_MaxVisibleVolumeCount); i++)
{
HomogeneousDensityVolume volume = volumes[i];
// Only test active finite volumes.
if (volume.enabled && volume.parameters.IsLocalVolume())
{
// TODO: cache these?
var obb = OrientedBBox.Create(volume.transform);
// Handle camera-relative rendering.
obb.center -= camOffset;
// Frustum cull on the CPU for now. TODO: do it on the GPU.
if (GeometryUtils.Overlap(obb, camera.frustum, 6, 8))
{
// TODO: cache these?
var properties = volume.parameters.GetProperties();
m_VisibleVolumeBounds.Add(obb);
m_VisibleVolumeProperties.Add(properties);
}
}
}
s_VisibleVolumeBoundsBuffer.SetData(m_VisibleVolumeBounds);
s_VisibleVolumePropertiesBuffer.SetData(m_VisibleVolumeProperties);
// Fill the struct with pointers in order to share the data with the light loop.
densityVolumes.bounds = m_VisibleVolumeBounds;
densityVolumes.properties = m_VisibleVolumeProperties;
return(densityVolumes);
}
}
public static void ComputeOrientedBBoxFromFalloffAndTransform(out OrientedBBox obb, ref VolumeFalloff falloff, Transform t)
{
Matrix4x4 m = falloff.isTransformScaleUsed
? (t.localToWorldMatrix * Matrix4x4.TRS(falloff.center, Quaternion.identity, falloff.size))
: Matrix4x4.TRS(t.position + (t.rotation * falloff.center), t.rotation, falloff.size);
obb = new OrientedBBox(m);
}
public void VoxelizeDensityVolumes(HDCamera camera, CommandBuffer cmd)
{
if (preset == VolumetricLightingPreset.Off)
{
return;
}
Vector3 camPosition = camera.camera.transform.position;
Vector3 camOffset = Vector3.zero; // World-origin-relative
if (ShaderConfig.s_CameraRelativeRendering != 0)
{
camOffset = -camPosition; // Camera-relative
}
m_VisibleVolumes.Clear();
m_VisibleVolumeProperties.Clear();
// Collect all the visible volume data, and upload it to the GPU.
HomogeneousDensityVolume[] volumes = Object.FindObjectsOfType(typeof(HomogeneousDensityVolume)) as HomogeneousDensityVolume[];
foreach (HomogeneousDensityVolume volume in volumes)
{
// Only test active finite volumes.
if (volume.enabled && volume.volumeParameters.IsLocalVolume())
{
// TODO: cache these?
var obb = OrientedBBox.Create(volume.transform);
// Frustum cull on the CPU for now. TODO: do it on the GPU.
if (GeometryUtils.Overlap(obb, camOffset, camera.frustum, 6, 8))
{
// TODO: cache these?
var properties = volume.volumeParameters.GetProperties();
m_VisibleVolumes.Add(obb);
m_VisibleVolumeProperties.Add(properties);
}
}
}
s_VisibleVolumesBuffer.SetData(m_VisibleVolumes);
s_VisibleVolumePropertiesBuffer.SetData(m_VisibleVolumeProperties);
}
public DensityVolumeList PrepareVisibleDensityVolumeList(HDCamera hdCamera, CommandBuffer cmd, float time)
{
DensityVolumeList densityVolumes = new DensityVolumeList();
if (!hdCamera.frameSettings.IsEnabled(FrameSettingsField.Volumetrics))
{
return(densityVolumes);
}
var visualEnvironment = VolumeManager.instance.stack.GetComponent <VisualEnvironment>();
if (visualEnvironment.fogType.value != FogType.Volumetric)
{
return(densityVolumes);
}
using (new ProfilingSample(cmd, "Prepare Visible Density Volume List"))
{
Vector3 camPosition = hdCamera.camera.transform.position;
Vector3 camOffset = Vector3.zero;// World-origin-relative
if (ShaderConfig.s_CameraRelativeRendering != 0)
{
camOffset = camPosition; // Camera-relative
}
m_VisibleVolumeBounds.Clear();
m_VisibleVolumeData.Clear();
// Collect all visible finite volume data, and upload it to the GPU.
DensityVolume[] volumes = DensityVolumeManager.manager.PrepareDensityVolumeData(cmd, hdCamera.camera, time);
for (int i = 0; i < Math.Min(volumes.Length, k_MaxVisibleVolumeCount); i++)
{
DensityVolume volume = volumes[i];
// TODO: cache these?
var obb = new OrientedBBox(Matrix4x4.TRS(volume.transform.position, volume.transform.rotation, volume.parameters.size));
// Handle camera-relative rendering.
obb.center -= camOffset;
// Frustum cull on the CPU for now. TODO: do it on the GPU.
// TODO: account for custom near and far planes of the V-Buffer's frustum.
// It's typically much shorter (along the Z axis) than the camera's frustum.
// XRTODO: fix combined frustum culling
if (GeometryUtils.Overlap(obb, hdCamera.frustum, 6, 8) || hdCamera.camera.stereoEnabled)
{
// TODO: cache these?
var data = volume.parameters.ConvertToEngineData();
m_VisibleVolumeBounds.Add(obb);
m_VisibleVolumeData.Add(data);
}
}
s_VisibleVolumeBoundsBuffer.SetData(m_VisibleVolumeBounds);
s_VisibleVolumeDataBuffer.SetData(m_VisibleVolumeData);
// Fill the struct with pointers in order to share the data with the light loop.
densityVolumes.bounds = m_VisibleVolumeBounds;
densityVolumes.density = m_VisibleVolumeData;
return(densityVolumes);
}
}
public DensityVolumeList PrepareVisibleDensityVolumeList(HDCamera camera, CommandBuffer cmd)
{
DensityVolumeList densityVolumes = new DensityVolumeList();
if (preset == VolumetricLightingPreset.Off)
{
return(densityVolumes);
}
var visualEnvironment = VolumeManager.instance.stack.GetComponent <VisualEnvironment>();
if (visualEnvironment.fogType != FogType.Volumetric)
{
return(densityVolumes);
}
VBuffer vBuffer = FindVBuffer(camera.GetViewID());
if (vBuffer == null)
{
return(densityVolumes);
}
using (new ProfilingSample(cmd, "Prepare Visible Density Volume List"))
{
Vector3 camPosition = camera.camera.transform.position;
Vector3 camOffset = Vector3.zero; // World-origin-relative
if (ShaderConfig.s_CameraRelativeRendering != 0)
{
camOffset = camPosition; // Camera-relative
}
m_VisibleVolumeBounds.Clear();
m_VisibleVolumeData.Clear();
// Collect all visible finite volume data, and upload it to the GPU.
DensityVolume[] volumes = DensityVolumeManager.manager.PrepareDensityVolumeData(cmd);
for (int i = 0; i < Math.Min(volumes.Length, k_MaxVisibleVolumeCount); i++)
{
DensityVolume volume = volumes[i];
// TODO: cache these?
var obb = OrientedBBox.Create(volume.transform);
// Handle camera-relative rendering.
obb.center -= camOffset;
// Frustum cull on the CPU for now. TODO: do it on the GPU.
if (GeometryUtils.Overlap(obb, camera.frustum, 6, 8))
{
// TODO: cache these?
var data = volume.parameters.GetData();
m_VisibleVolumeBounds.Add(obb);
m_VisibleVolumeData.Add(data);
}
}
s_VisibleVolumeBoundsBuffer.SetData(m_VisibleVolumeBounds);
s_VisibleVolumeDataBuffer.SetData(m_VisibleVolumeData);
// Fill the struct with pointers in order to share the data with the light loop.
densityVolumes.bounds = m_VisibleVolumeBounds;
densityVolumes.density = m_VisibleVolumeData;
return(densityVolumes);
}
}
