static void setMatrices(vcg::Point3f L, int screensize, int screensizeHard, bool sx){
// orthonormal basis
L.Normalize();
Point3f ax,ay,az=L;
ax=az^Point3f(1,0,0);
if (ax.SquaredNorm()<0.1) ax=az^Point3f(0,1,0);
ax=ax.Normalize();
ay=(az^ax).Normalize();
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
/* if (!sx) {
glScalef(1,1,-1);
}*/
GLfloat nearPlane = 1.0;
GLfloat farPlane = 201;
glOrtho(-1,+1,-1,+1, nearPlane, farPlane);
glMatrixMode(GL_MODELVIEW);
// PREPARE MATRIX for shadow test...
glPushMatrix();
glLoadIdentity();
glOrtho(-1,+1,-1,+1, nearPlane, farPlane);
gluLookAt(0,0,-4, 0,0,0, 0,1,0);
gluLookAt( az[0],az[1],az[2], 0,0,0, ay[0], ay[1], ay[2] );
float r=shadowmap.m.r;
float px=shadowmap.m.px;
float py=shadowmap.m.py;
float pz=shadowmap.m.pz;
glScalef(1/r,1/r,1/r);
glTranslatef(-px,-py,-pz);
glGetFloatv(GL_MODELVIEW_MATRIX, &(matSM[0][0]));
// ...done!
glLoadIdentity();
gluLookAt(0,0,-4, 0,0,0, 0,1,0);
gluLookAt( az[0],az[1],az[2], 0,0,0, ay[0], ay[1], ay[2] );
//shadowScaleFactor=extractCurrentScaleFactor()/r;
glGetIntegerv(GL_VIEWPORT, lastviewport);
if (sx) {
glViewport(0,0,screensize,screensize);
glEnable(GL_SCISSOR_TEST);
glScissor(0,0,screensize,screensize);
}
else {
glViewport(screensize,0,screensize,screensize);
glEnable(GL_SCISSOR_TEST);
glScissor(screensize,0,screensize,screensize);
}
HSratio = float(screensize) / float(screensizeHard) ;
//for (int i=0; i<4; i++)
//for (int j=0; j<2; j++) matSM[i][j] /=ratio;
}
