Hi Simon,
for the small feature detection I do the following in the RenderAction
perhaps this helps.
Andreas
bool RenderAction::isSmallFeature(const NodePtr &node)
{
if(node == NullFC)
return true;
if(!_bSmallFeatureCulling)
return false;
//node->updateVolume();
DynamicVolume vol = node->getVolume();
vol.transform(top_matrix());
Pnt3f p[8];
vol.getBounds(p[0], p[4]);
p[1].setValues(p[0][0], p[4][1], p[0][2]);
p[2].setValues(p[4][0], p[4][1], p[0][2]);
p[3].setValues(p[4][0], p[0][1], p[0][2]);
p[5].setValues(p[4][0], p[0][1], p[4][2]);
p[6].setValues(p[0][0], p[0][1], p[4][2]);
p[7].setValues(p[0][0], p[4][1], p[4][2]);
for(int i=0;i<8;++i)
_worldToScreenMatrix.multFullMatrixPnt(p[i]);
Pnt2f min(OSG::Inf, OSG::Inf);
Pnt2f max(OSG::NegInf, OSG::NegInf);
for(int i=0;i<8;++i)
{
if(p[i][0] < min[0])
min[0] = p[i][0];
if(p[i][1] < min[1])
min[1] = p[i][1];
if(p[i][0] > max[0])
max[0] = p[i][0];
if(p[i][1] > max[1])
max[1] = p[i][1];
}
//for(int i=0;i<8;++i)
// printf("p%d: %f %f\n", i, p[i][0], p[i][1]);
Real32 w = ((max[0] - min[0]) / 2.0f) *
Real32(_viewport->getPixelWidth());
Real32 h = ((max[1] - min[1]) / 2.0f) *
Real32(_viewport->getPixelHeight());
Real32 f = w * h;
//printf("%f %f pixels: %f x %f = %f\n", max[0] - min[0], max[1] -
min[1], w, h, f);
if(f <= _smallFeaturesPixels)
return true;
return false;
}
> hi andreas
>
>
>>can you try to add
>>
>>sphereVol.transform(ra->top_matrix());
>>
>>before
>>
>>sphereVol.transform(matToScreen);
>
>
> thanks for the hint, unfortunately it makes no difference. i
> thought that Camera::getWorldToScreen(..) should give me
> coordinates in the range of -1..1, which then have to be scaled
> with the viewport dimensions.
>
> right now, the projected radius of the bounding sphere does not
> change when tumbling/zooming the cam.
>
> do i also have to apply RenderAction::getActNode()->getToWorld(..)?
>
> thanks & regards,
> simon
>
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>
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
_______________________________________________
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