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robcat2075

Baking some AO in Bump Mapped textures

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Bump maps creates the illusion of surface shape details but only in a simple shading manner. They don't change the surface shape.

 

AO and Fake AO depends on actual surface shape to create its shading effect in the recesses and crevices of a model.

 

Here's a surface with a bump map applied. The shading in the recesses represents the direct light only and not the environment illumination

 

BumpOnly0.jpg

 

By processing the bump map we can make another map that shades the recesses approximately the way the ambient light would. Here's that map added as a Diffuse Map to the surface.

 

BumpAndDiffB0.jpg

 

 

Here's the original test image...

BumpMapAO_Step1.JPG

 

 

Now blurred with Gaussian Blur... (this is saved and used as the BumpMap)

BumpMapAO_Step2.JPG

 

 

 

In Photoshop Other>High Pass filter...

BumpMapAO_Step3.JPG

 

 

 

In Photoshop Adjust>Curves to scrunch the grays up closer to white... (this is saved and used as the Diffuse map at 40%)

BumpMapAO_Step4.JPG

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Fantastic! The subtle differences between the renders really make a huge difference between "obvious bump map" and "or is it?"

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thanks, both of you!

 

I should note that the numerical settings for every filter were eyeball guesstimates. Larger or smaller numbers may work in different situations like if the maps were a higher res.

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