Evan O'Toole wrote:
No matter what value I enter for opacityPercentage, from zero to 100, the
volume ends up looking the same.
I forgot to mention in my previous post that I'm running osg version 2.6.0.
Hi, Evan,
You're halfway there. You also need to enable blending:
osg::StateSet *stateSet = geometry->getOrCreateStateSet();
stateSet->setMode(GL_BLEND, osg::StateAttribute::ON);
You also will probably want to depth-sort the geometry, and make sure
it's drawn later than any opaque geometry (so the blending will work
properly):
stateSet->setRenderBinDetails(1, "DepthSortedBin");
This should work, but I also noticed that you're using an indexed color
list. This is a sure-fire way to low frame rates. You've also declared
the index array wrong (it should just be UIntArray *colorIndexArray),
but that's not important. Keep away from indexed lists. They're only
present for backward compatibility. No modern graphics card works well
using indexed lists.
Since all of your colors are the same in this case, you can use an
overall color, like this:
//Set the color
float opacityPercentage(20.0);
osg::Vec4 color(0.75, 0.75, 0.75, (opacityPercentage / 100.0)); //Light grey
osg::Vec4Array* colors = new osg::Vec4Array;
colors->push_back(color);
//Assign the color to each of the sides
geometry->setColorArray(colors);
geometry->setColorBinding(osg::Geometry::BIND_OVERALL);
If you do need different color values, you can use per-vertex colors
instead. Don't use per-primitive colors, though (anything with
per-primitive binding will also render slowly).
--"J"
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