void
VisWinLighting::UpdateLightPositions()
{
if (mediator.GetMode() == WINMODE_3D)
{
//
// Get the camera's distance from the focal point.
//
vtkCamera *cam = mediator.GetCanvas()->GetActiveCamera();
double cpos[3], cfoc[3], proj[3], projLen = 0.;
cam->GetPosition(cpos);
cam->GetFocalPoint(cfoc);
proj[0] = cpos[0] - cfoc[0];
proj[1] = cpos[1] - cfoc[1];
proj[2] = cpos[2] - cfoc[2];
int i;
for (i = 0; i < 3; i++)
{
projLen += (proj[i] * proj[i]);
}
projLen = sqrt(projLen);
//
// VisIt lights have a unit vector direction, pointing
// from the light's position to the focal point. We need
// to use the inverse vector in determing the position
// in world coordinates. We want to position the light
// so that vtk passes a unit vector for the light direction
// along the (inverse) direction vector to OpenGL.
//
double pos[3];
avtLight aLight;
for (i = 0; i < MAX_LIGHTS ; i++)
{
aLight = avtlights.Light(i);
if (aLight.type == CAMERA)
{
lights[i]->SetPosition(-aLight.direction[0],
-aLight.direction[1],
-aLight.direction[2]);
lights[i]->SetFocalPoint(0, 0, 0);
}
else
{
pos[0] = cfoc[0] - aLight.direction[0] / projLen;
pos[1] = cfoc[1] - aLight.direction[1] / projLen;
pos[2] = cfoc[2] - aLight.direction[2] / projLen;
lights[i]->SetPosition(pos);
lights[i]->SetFocalPoint(cfoc);
}
}
}
else
{
InitDefaultLight();
}
}
VisWinLighting::VisWinLighting(VisWindowColleagueProxy &p) : VisWinColleague(p)
{
vtkRenderer *canvas = mediator.GetCanvas();
for (int i = 0 ; i < MAX_LIGHTS ; i++)
{
lights[i] = vtkLight::New();
canvas->AddLight(lights[i]);
}
InitDefaultLight();
}
void
VisWinLighting::Stop3DMode()
{
InitDefaultLight();
}
Light::Light()
{
InitDefaultLight();
}
