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Ambient occlusion question
Okay, so I'm texturing an object with the intention of importing it into Unreal. Right now, I have only completed the diffuse map in Photoshop, and applied it to the object in Max. Would I be correct in applying the AO map within the diffuse color map? Is it ever applied elsewhere? I don't have any issues with the concept… -
Re: Ambient occlusion question
Just thinking out loud here, haven't really got a chance to test this theory. But what if the color texture already has a pretty dark/near black texture? Then multiplying the AO into the diffuse won't amplify the dark effect that much. In that case you ought to benefit more from multiplying a separate AO map into the… -
Re: Ambient occlusion question
Your rendering formula is wrong. It's really: diffuse texture * lighting where lighting is the sum of all lights: diffuse texture * (direct lighting + ambient lighting) and if you have ao: diffuse texture * (direct lighting + (ambient lighting * AO) ) . It's not expensive at all depending on the rendering style, forward… -
Re: Ambient occlusion question
Yeah for Unreal, go for it, layer it onto your diffuse. If your object had a lot of stacked UVs and needed a different UV layout to get a nice AO onto it, you would need to keep it as a separate texture (or stick it in a alpha channel) and blend it onto your diffuse, etc... in Unreal using the material editor. -
Re: Ambient occlusion question
No because the AO would derive from your diffuse map, adding a global ambient light just brightens it all up, doesn't affect contrast. -
Re: Ambient occlusion question
I think what I'm trying to say is that with ao pre-multiplied into the diffuse texture can you ever achieve a perfect black color if you have a global ambient light that is lighting everything a wee bit? -
Re: Ambient occlusion question
Thanks for the replies, guys. For now, I think I'll just keep it in the Diffuse map. I haven't really worked much with lighting in UE3 (or Max, for that matter), so for now I'll just incorporate it into my textures and worry about lighting in-engine as and when it presents itself, and once I'm a little more confident.… -
Re: Ambient occlusion question
Pior> Most definitely. But in that case you are using the AO pass as a mask for something else you are trying to achieve, such as dirt in cavities, etc. But yeah, I agree. Using the AO as a mask for dirt/dust/whatever in your diffuse is helpful. The original intention of the ambient occlusion was to occlude ambient. In… -
Re: Ambient occlusion question
AO maps, curvature maps, etc. are very helpful to give models volume, not only dirt. Without a smooth AO applied on the diffuse, a normal map model is like flat when lights kills the fake effect. Realtime AO is still very expensive to compute for graphics cards, and a good prerendered/fixed AO map is very soft like to… -
Re: Ambient occlusion question
Here's my take on this issue. If your engine supports AO as a seperate bitmap/channel then don't add it in your diffuse. I'm not used to working with UE, but is there a way to multiply this into your ambient lighting? If so then that's probably what you want to be doing. [ame]…
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