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FSXA Bump & Specular mapping decrease fps?

jtanabodee

Resource contributor
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3,883
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thailand
Hi,
I'd like to know if bump and specular mapping decrease fps. I have searched but no answer for this at all.

I have used in a lot of models in FSX version of VTBS. The frame rate is not so good. But I'm not sure if bump and specular mapping cause this. How do we know that?
Thanks,
Tic
 

arno

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FSDevConf team
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Hi,

Yes they increase complexity and thus the performance. However I can't tell you how big the influence is.
 
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9
In most cases a bump/specular map can be smaller in size. If the diffuse map is 1024x1024 the bump/specular can be 512x512. Most of the time you won't notice the difference.
However, if the bump map is defining lines, rivits etc., then a smaller size is not a good solution
 

arno

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FSDevConf team
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Hi,

I think most of the overhead is from the fact that the bump or specular map is there. Smaller sizes might help a bit, but not too much on a modern graphics card.
 

jtanabodee

Resource contributor
Messages
3,883
Country
thailand
In most cases a bump/specular map can be smaller in size. If the diffuse map is 1024x1024 the bump/specular can be 512x512. Most of the time you won't notice the difference.
However, if the bump map is defining lines, rivits etc., then a smaller size is not a good solution

I have tried to resize specular mapping but thing is different. Mapping does not match the texture. I got THAI logo reflexion on the top of airport bus! So, I think resize does not work. Anyone face this problem?
 
Messages
9
I am not sure if I understand your problem. If you have assigned the UV coordinates correctly to your model, the texture should show up in the right place no matter what size it is.

Just in case. Remember, if you are creating the texture in Photoshop, you have to flip it before you can use it in FSX.

Reco
 
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