Additive Reflection

[EmilioDrax]

As suggested in this post: http://stackoverflow.com/questions/13067079/additive-reflection-in-three-js i'd like to request additive reflections. If you have a Environment map which is black and white, you sometimes want to have only the whites to lighten your texture up but not the blacks to darken it. Somehow like a specular reflection, but with an Environment map. Or like an additive blending in photoshop.

Thank you guys for your amazing work!

[alteredq]

Hmmm, there have been always some looks that were hard to achieve with cube maps, maybe this would help. We could add additive combine mode for environment mapping.

Could you put somewhere an example of such model and cubemap for testing?

[EmilioDrax]

https://dl.dropbox.com/u/48050531/webgl_loader_obj.html

Left to Right: only Illumination, Reflection: 0.4, Reflection: -0.4 and inverted and crunched Environmentmap (see Stackoverflow)

The third version actually works pretty well...

in this case the goal was to create something like porcelain http://media.treehugger.com/assets/images/2011/10/leo-battistelli-recovered-porcelain-1.JPG

[alteredq]

Cool, thanks. I added a new combine type - AddOperation.

This is how it looks (center one):

https://dl.dropbox.com/u/26786471/tmp/tests/additive-reflection/webgl_loader_obj2.html

[mrdoob]

Yay!

[EmilioDrax]

nice! thanx guys! Looks much better in darker areas and doesn't change the saturation so much

[mrdoob]

Indeed! It's great to finally have additive environment mapping. This is such a common an effective resource in the demoscene ^^