mirror/OpenMW
1
0
Fork 0
mirror of https://gitlab.com/OpenMW/openmw.git synced 2025-02-04 03:40:14 +00:00
Code Issues Projects Releases Wiki Activity

Add clipping planes when allow shadow map overlap is enabled

Browse Source
This commit is contained in:
AnyOldName3 2018-08-23 13:14:02 +01:00
parent 25e92481f4
commit db707a31ec
2 changed files with 28 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

40
components/sceneutil/mwshadowtechnique.cpp
View File

@ -1243,10 +1243,16 @@ void MWShadowTechnique::cull(osgUtil::CullVisitor& cv)
} }
} }
std::vector<osg::Plane> extraPlanes;
if (settings->getMultipleShadowMapHint() == ShadowSettings::CASCADED) if (settings->getMultipleShadowMapHint() == ShadowSettings::CASCADED)
cropShadowCameraToMainFrustum(frustum, camera, cascaseNear, cascadeFar); {
cropShadowCameraToMainFrustum(frustum, camera, cascaseNear, cascadeFar, extraPlanes);
for (auto plane : extraPlanes)
local_polytope.getPlaneList().push_back(plane);
local_polytope.setupMask();
}
else else
cropShadowCameraToMainFrustum(frustum, camera, reducedNear, reducedFar); cropShadowCameraToMainFrustum(frustum, camera, reducedNear, reducedFar, extraPlanes);
osg::ref_ptr<VDSMCameraCullCallback> vdsmCallback = new VDSMCameraCullCallback(this, local_polytope); osg::ref_ptr<VDSMCameraCullCallback> vdsmCallback = new VDSMCameraCullCallback(this, local_polytope);
camera->setCullCallback(vdsmCallback.get()); camera->setCullCallback(vdsmCallback.get());
@ -1873,16 +1879,12 @@ struct ConvexHull
{ {
typedef std::set<osg::Vec3d> VertexSet; typedef std::set<osg::Vec3d> VertexSet;
double lowestPoint = DBL_MAX;
// Collect the set of vertices // Collect the set of vertices
VertexSet vertices; VertexSet vertices;
for (Edge edge : _edges) for (Edge edge : _edges)
{ {
vertices.insert(edge.first); vertices.insert(edge.first);
vertices.insert(edge.second); vertices.insert(edge.second);
lowestPoint = osg::minimum(lowestPoint, edge.first.z());
lowestPoint = osg::minimum(lowestPoint, edge.second.z());
} }
if (vertices.size() == 0) if (vertices.size() == 0)
@ -1893,19 +1895,18 @@ struct ConvexHull
VertexSet extremeVerticesSet(extremeVertices.cbegin(), extremeVertices.cend()); VertexSet extremeVerticesSet(extremeVertices.cbegin(), extremeVertices.cend());
// Add their extrusions to the final edge collection // Add their extrusions to the final edge collection
// We extrude as far as -1.5 as the coordinate space shouldn't ever put any shadow casters further than -1.0
Edges finalEdges; Edges finalEdges;
// Add edges towards -Z // Add edges towards -Z
for (auto vertex : extremeVertices) for (auto vertex : extremeVertices)
finalEdges.push_back(Edge(vertex, osg::Vec3d(vertex.x(), vertex.y(), -DBL_MAX))); finalEdges.push_back(Edge(vertex, osg::Vec3d(vertex.x(), vertex.y(), -1.5)));
// Add edge loop to 'seal' the hull // Add edge loop to 'seal' the hull
for (auto itr = extremeVertices.cbegin(); itr != extremeVertices.cend() - 1; ++itr) for (auto itr = extremeVertices.cbegin(); itr != extremeVertices.cend() - 1; ++itr)
finalEdges.push_back(Edge(osg::Vec3d(itr->x(), itr->y(), -DBL_MAX), osg::Vec3d((itr + 1)->x(), (itr + 1)->y(), -DBL_MAX))); finalEdges.push_back(Edge(osg::Vec3d(itr->x(), itr->y(), -1.5), osg::Vec3d((itr + 1)->x(), (itr + 1)->y(), -1.5)));
// The convex hull algorithm we are using sometimes places a point at both ends of the vector, so we don't always need to add the last edge separately. // The convex hull algorithm we are using sometimes places a point at both ends of the vector, so we don't always need to add the last edge separately.
if (extremeVertices.front() != extremeVertices.back()) if (extremeVertices.front() != extremeVertices.back())
finalEdges.push_back(Edge(osg::Vec3d(extremeVertices.front().x(), extremeVertices.front().y(), -DBL_MAX), osg::Vec3d(extremeVertices.back().x(), extremeVertices.back().y(), -DBL_MAX))); finalEdges.push_back(Edge(osg::Vec3d(extremeVertices.front().x(), extremeVertices.front().y(), -1.5), osg::Vec3d(extremeVertices.back().x(), extremeVertices.back().y(), -1.5)));
// Just in case using -DBL_MAX upsets some of the maths, we pretend we've only extended the volume by a little bit.
lowestPoint -= 1.0;
// Remove internal edges connected to extreme vertices // Remove internal edges connected to extreme vertices
for (auto vertex : extremeVertices) for (auto vertex : extremeVertices)
{ {
@ -1917,7 +1918,7 @@ struct ConvexHull
else if (edge.second == vertex) else if (edge.second == vertex)
connectedVertices.push_back(edge.first); connectedVertices.push_back(edge.first);
} }
connectedVertices.push_back(osg::Vec3d(vertex.x(), vertex.y(), lowestPoint)); connectedVertices.push_back(osg::Vec3d(vertex.x(), vertex.y(), -1.5));
Vertices unwantedEdgeEnds = findInternalEdges(vertex, connectedVertices); Vertices unwantedEdgeEnds = findInternalEdges(vertex, connectedVertices);
for (auto edgeEnd : unwantedEdgeEnds) for (auto edgeEnd : unwantedEdgeEnds)
@ -2381,11 +2382,12 @@ struct RenderLeafBounds
double min_z, max_z; double min_z, max_z;
}; };
bool MWShadowTechnique::cropShadowCameraToMainFrustum(Frustum& frustum, osg::Camera* camera, double viewNear, double viewFar) bool MWShadowTechnique::cropShadowCameraToMainFrustum(Frustum& frustum, osg::Camera* camera, double viewNear, double viewFar, std::vector<osg::Plane>& planeList)
{ {
osg::Matrixd light_p = camera->getProjectionMatrix(); osg::Matrixd light_p = camera->getProjectionMatrix();
osg::Matrixd light_v = camera->getViewMatrix(); osg::Matrixd light_v = camera->getViewMatrix();
osg::Matrixd light_vp = light_v * light_p; osg::Matrixd light_vp = light_v * light_p;
osg::Matrixd oldLightP = light_p;
ConvexHull convexHull; ConvexHull convexHull;
convexHull.setToFrustum(frustum); convexHull.setToFrustum(frustum);
@ -2433,6 +2435,18 @@ bool MWShadowTechnique::cropShadowCameraToMainFrustum(Frustum& frustum, osg::Cam
light_p.postMult(m); light_p.postMult(m);
camera->setProjectionMatrix(light_p); camera->setProjectionMatrix(light_p);
convexHull.transform(osg::Matrixd::inverse(oldLightP));
xMin = convexHull.min(0);
xMax = convexHull.max(0);
yMin = convexHull.min(1);
yMax = convexHull.max(1);
planeList.push_back(osg::Plane(0.0, -1.0, 0.0, yMax));
planeList.push_back(osg::Plane(0.0, 1.0, 0.0, -yMin));
planeList.push_back(osg::Plane(-1.0, 0.0, 0.0, xMax));
planeList.push_back(osg::Plane(1.0, 0.0, 0.0, -xMin));
} }
return true; return true;

2
components/sceneutil/mwshadowtechnique.hpp
View File

@ -205,7 +205,7 @@ namespace SceneUtil {
virtual bool computeShadowCameraSettings(Frustum& frustum, LightData& positionedLight, osg::Matrixd& projectionMatrix, osg::Matrixd& viewMatrix); virtual bool computeShadowCameraSettings(Frustum& frustum, LightData& positionedLight, osg::Matrixd& projectionMatrix, osg::Matrixd& viewMatrix);
virtual bool cropShadowCameraToMainFrustum(Frustum& frustum, osg::Camera* camera, double viewNear, double viewFar); virtual bool cropShadowCameraToMainFrustum(Frustum& frustum, osg::Camera* camera, double viewNear, double viewFar, std::vector<osg::Plane>& planeList);
virtual bool adjustPerspectiveShadowMapCameraSettings(osgUtil::RenderStage* renderStage, Frustum& frustum, LightData& positionedLight, osg::Camera* camera, double viewNear, double viewFar); virtual bool adjustPerspectiveShadowMapCameraSettings(osgUtil::RenderStage* renderStage, Frustum& frustum, LightData& positionedLight, osg::Camera* camera, double viewNear, double viewFar);