heat map with penumbra?

[Ranjit]

Is penumbra a good tool to use for drawing a heat map from a 2d java
array? And are there any examples in other languages of how to do
that? I don't know any OpenGL yet so I'm not really sure how to go
about this, but I assume it's possible.

Thanks,

-Ranjit

[Zach Tellman]

If you can represent your heatmap as a BufferedImage, you could then
turn that image into a texture. Generally speaking, textures are the
proper way to represent 2d grids of information.

Zach