How to flip an iBillboardSceneNode

[Markuss]

Im animating a sprite on an iBillboardSceneNode. Id like to be able to flip it horizontally when moving left. I was hoping for a flip function but I cant seem to find one?

[CuteAlien]

Yeah, a bit tricky as meshbuffers are mostly rebuild each frame.
In Irrlicht svn trunk you can now go over uv coordinates, like:

Code: Select all

		// Flip upside-down
		scene::IMeshBuffer* mb = billboard->getMeshBuffer(0);
		video::S3DVertex* vertices = static_cast<video::S3DVertex*>(mb->getVertices());
		u32 vertCount = mb->getVertexCount();
		for ( u32 v=0; v < vertCount; ++v )
		{
			vertices[v].TCoords.Y = 1.f - vertices[v].TCoords.Y;
		}

In Irrlicht 1.8 getMeshBuffer did not exist yet. So the only clean option there is copying the CBillboardSceneNode code, renaming it and creating your own SceneNode that way. Then give yourself access to the video::S3DVertex vertices[4]; in there. And do as in code above.


edit: Argh, forget all I wrote - it's all horrible, horrible, horrible!!!

The real solution - which works in Irrlicht 1.8 as well:

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billboard->getMaterial(0).getTextureMatrix(0).setTextureScale(1.f, -1.f);

Yeah... I totally forgot (and not for the first time) we have texture matrices

[Markuss]

Thank you so much!