//! set the bounding volume of the node
void DVRVolume::adjustVolume(Volume &volume)
{
volume.setValid();
volume.setEmpty();
DVRVolumeTexturePtr tex = DVRVOLUME_PARAMETER(this, DVRVolumeTexture);
if (tex != NullFC)
{
const Vec3f & res = tex->getResolution ();
const Vec3f & slice = tex->getSliceThickness();
Vec3f minBB(-0.5f * res[0] * slice[0],
-0.5f * res[1] * slice[1],
-0.5f * res[2] * slice[2]);
Vec3f maxBB(-minBB);
volume.extendBy(minBB);
volume.extendBy(maxBB);
}
else
{
// something wrong with initialization - show boundingbox either
Vec3f minBB(-0.5, -0.5, -0.5);
Vec3f maxBB( 0.5, 0.5, 0.5);
volume.extendBy(minBB);
volume.extendBy(maxBB);
}
}
void DVRVolume::initializeClipObjects( DrawActionBase *action,
const Matrix &volumeToWorld)
{
DVRClipObjectsPtr clipObjects = DVRVOLUME_PARAMETER(this, DVRClipObjects);
if(clipObjects != NullFC &&
clipObjects->getClipMode() != DVRClipObjects::Off)
{
DVRVolumeTexturePtr tex = DVRVOLUME_PARAMETER(this, DVRVolumeTexture);
if(tex != NullFC)
{
const Vec3f &res = tex->getResolution();
const Vec3f &slice = tex->getSliceThickness();
Vec3f diag(res[0] * slice[0],
res[1] * slice[1],
res[2] * slice[2]);
Vec3f sliceDir;
if(getShader()->useMTSlabs())
{
Slicer::getAASlicingDirection(action,&sliceDir);
}
else
{
switch (getTextures2D())
{
case 0: // 3D textures
Slicer::getSlicingDirection(action, &sliceDir);
break;
case 1: // 2D textures
Slicer::getAASlicingDirection(action, &sliceDir);
break;
default: // auto
Window *window = action->getWindow();
if(window->hasExtension(_extTex3D))
Slicer::getSlicingDirection(action, &sliceDir);
else
Slicer::getAASlicingDirection(action, &sliceDir);
}
}
Plane clipReferencePlane(sliceDir, -0.5f * diag.length());
clipObjects->initialize(volumeToWorld, clipReferencePlane);
clipper.setReferencePlane(clipReferencePlane);
}
}
}
