Hi,
i'm looking for give to an 3d object, some transparent value (not completely
transparency) . So, i'm starting from osgclip example, to make trasparent (with
0.5 opacity) the wireframe part of the cow.
part of the c++ code :
osg::Node* decorate_with_clip_node(osg::Node* subgraph)
{
...
float Opacity=0.5;
osg::Material * material = (osg::Material *)
wireframe_subgraph->getOrCreateStateSet()->getAttribute(osg::StateAttribute::MATERIAL);
material->setTransparency(osg::Material::FRONT_AND_BACK, 1. - Opacity);
wireframe_subgraph->getStateSet()->setRenderBinDetails(0,
"transparent");
wireframe_subgraph->getStateSet()->setMode( GL_BLEND,
osg::StateAttribute::ON );
wireframe_subgraph->getStateSet()->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);
wireframe_subgraph->getStateSet()->setAttributeAndModes(material,
osg::StateAttribute::OVERRIDE);
wireframe_subgraph->addChild(subgraph);
rootnode->addChild(wireframe_subgraph);
...
At runtime, at :
material->setTransparency(osg::Material::FRONT_AND_BACK, 1. - Opacity);
i get the following error :
Access violation in the writing of the address ...
and the check is on the following methods:
void Material::setTransparency(Face face,float transparency)
{
//clampBetweenRange(transparency,0.0f,1.0f,"Material::setTransparency()");
if (face==FRONT || face==FRONT_AND_BACK)
{
_ambientFront[3] = 1.0f-transparency; // I get error here
_diffuseFront[3] = 1.0f-transparency;
_specularFront[3] = 1.0f-transparency;
_emissionFront[3] = 1.0f-transparency;
}
if (face==BACK || face==FRONT_AND_BACK)
{
_ambientBack[3] = 1.0f-transparency;
_diffuseBack[3] = 1.0f-transparency;
_specularBack[3] = 1.0f-transparency;
_emissionBack[3] = 1.0f-transparency;
}
}
Could you suggest me to solve this problem?
Thank you!
Cheers,
Andrea
------------------
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http://forum.openscenegraph.org/viewtopic.php?p=37885#37885
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