opengl texture loading with alpha threshold?

[deets]

I'm displaying a bunch of billboard-nodes. These come with a texture that has a very "sophisticated" alpha-channel.

However, the resulting images don't reflect this.

See

http://attomaaku.com/screenshot.png

and

http://attomaaku.com/blase_30.png

for the original.


The billboard node + material are created as follows:

Code: Select all

  _node = world._smgr->addBillboardSceneNode(0, core::dimension2d<f32>(_radius * 2, _radius * 2));
  _node->setMaterialFlag(video::EMF_LIGHTING, false);
  _node->setMaterialFlag(video::EMF_ZWRITE_ENABLE, false);
  _node->setMaterialType(video::EMT_TRANSPARENT_ALPHA_CHANNEL);
  _node->setMaterialTexture(0, _world._driver->getTexture(texture_path(_world._resourcePath, "blase_30.png")));

Any suggestions?

[deets]

Ok, I found this:

http://irrlicht.sourceforge.net/phpBB2/ ... +threshold

So setting

Code: Select all

  _node->getMaterial(0).MaterialTypeParam = -1.0f; 

did the trick.

Is that somewhere documented?

[hybrid]

For Irrlicht 1.5 there is usually no need to change the parameter for high quality transparency, you can only improve the render performance by setting the values higher. If you use an older version of Irrlicht, you should set the value to 0.01f (negative values are nonsense).