Can you do this in Irrlicht:
1. Add cube node
2. Increase the scale of the cube then blur the cube node (maybe with a shader) and render this to the stencil buffer
3. Blend the buffer and render the scene
Thus creating a soft colored halo to the cube kind of like a stencil shadow but with 0 depth something like the image below.
An example/code snippet would be very much appreciated
Thanks
Halo effect
No one probably has code on hand, but if you are a competent programmer it shouldn't be a problem to produce what JP said above. And if it is, then you could go the old-school way and do a stencil buffer halo effect, except it won't have the falloff that you would get by doing JP's way.
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