FGFS-4.1/OpenSceneGraph
4
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Added test code to explore problems with LightSpacePerspectiveShadowMap implementation handling of different datasets and camera settings.

Browse Source
This commit is contained in:
Robert Osfield
2011-02-22 14:21:34 +00:00
parent 7792f1ce5b
commit d73f37e841
1 changed files with 43 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

47
src/osgShadow/LightSpacePerspectiveShadowMap.cpp
View File

@@ -16,6 +16,7 @@
#include <osgShadow/LightSpacePerspectiveShadowMap>
#include <osg/io_utils>
#include <iostream>
#include <iomanip>
@@ -27,6 +28,8 @@
#define LISPSM_ALGO DIRECTIONAL_ADAPTED
//#define LISPSM_ALGO DIRECTIONAL_AND_SPOT
#define ROBERTS_TEST_CHANGES 1
#define PRINT_COMPUTED_N_OPT 0
using namespace osgShadow;
@@ -279,8 +282,13 @@ void LightSpacePerspectiveShadowMapAlgorithm::operator()
m.makeLookAt( eye, center, up );
osg::BoundingBox bb = hullShadowedView->computeBoundingBox( mvpLight * m );
if( !bb.valid() )
if( !bb.valid() )
{
#if ROBERTS_TEST_CHANGES
OSG_NOTICE<<"LightSpacePerspectiveShadowMapAlgorithm::operator() invalid bb A"<<std::endl;
#endif
return;
}
double nearDist = -bb._max[2];
@@ -310,10 +318,24 @@ void LightSpacePerspectiveShadowMapAlgorithm::operator()
// checking light postperspective transform camera z ( negative value means this )
// and make sure min distance to shadow hull is clamped to positive value.
if( eye[2] < 0 && nearDist <= 0 ) {
if( eye[2] < 0 && nearDist <= 0 )
{
float clampedNearDist = 0.0001;
eye += viewDir * ( clampedNearDist - nearDist );
nearDist = clampedNearDist;
#if ROBERTS_TEST_CHANGES
OSG_NOTICE<<"LightSpacePerspectiveShadowMapAlgorithm::operator() adjusting eye"<<std::endl;
#endif
}
#endif
#if ROBERTS_TEST_CHANGES
if (nearDist<0.0)
{
nearDist = 0.0;
OSG_NOTICE<<"LightSpacePerspectiveShadowMapAlgorithm::operator() nearDist<0.0, resetting to 0.0."<<std::endl;
}
#endif
@@ -331,8 +353,13 @@ void LightSpacePerspectiveShadowMapAlgorithm::operator()
osg::Matrix lightView; // compute coarse light view matrix
lightView.makeLookAt( eye, eye + lightDir, up );
bb = hullShadowedView->computeBoundingBox( mvpLight * lightView );
if( !bb.valid() )
if( !bb.valid() )
{
#if ROBERTS_TEST_CHANGES
OSG_NOTICE<<"LightSpacePerspectiveShadowMapAlgorithm::operator() invalid bb B"<<std::endl;
#endif
return;
}
//use the formulas from the LiSPSM paper to get n (and f)
const double dotProd = viewDir * lightDir;
@@ -342,7 +369,16 @@ void LightSpacePerspectiveShadowMapAlgorithm::operator()
//perspective transform depth light space y extents
const double d = fabs( bb._max[1]-bb._min[1]);
const double z_f = z_n + d*sinGamma;
const double n = (z_n+sqrt(z_f*z_n))/sinGamma;
double n = (z_n+sqrt(z_f*z_n))/sinGamma;
#if ROBERTS_TEST_CHANGES
// clamp the localtion of p so that it isn't too close to the eye as to cause problems
if (n<d*0.05)
{
n=d*0.05;
OSG_NOTICE<<"LightSpacePerspectiveShadowMapAlgorithm::operator() n too small, clamping n to 0.05*d."<<std::endl;
}
#endif
const double f = n+d;
osg::Vec3d pos = eye-up*(n-nearDist);
lightView.makeLookAt( pos, pos + lightDir, up );
@@ -359,6 +395,9 @@ void LightSpacePerspectiveShadowMapAlgorithm::operator()
cameraShadow->setProjectionMatrix
( cameraShadow->getProjectionMatrix() * lightView * lispProjection );
//OSG_NOTICE<<"LightSpacePerspectiveShadowMapAlgorithm::operator() normal case dotProd="<<dotProd<<", sinGamma="<<sinGamma<<" d="<<d<<", pos=("<<pos<<"), (n-nearDist)="<<(n-nearDist)<<std::endl;
//OSG_NOTICE<<" eye=("<<eye<<"), up=("<<up<<"), n="<<n<<", nearDist="<<nearDist<<", z_n="<<z_n<<", z_f="<<z_f<<std::endl;
}
#endif