Artur,
Our 3DS loader does indeed double the number of triangles for two sided
materials. It's a simple solution to getting the lighting to work
correctly. If the material wasn't lit then cull_none would be a lot
easier (we tried that first).
As to why the stripifier is making the situation even worse, I can only
guess that because of the way the triangles are duplicated for two sided
materials this may be presenting a worst case situation to the
stripifier.
- John Wright
Starfire Research
Artur Biesiadowski wrote:
>
> There is a strange thing going on with number of triangles. I have a 3ds
> model. When viewed inside openfx it has 6236 triangles. When loaded
> inside j3dfly it has 12472 triangles. 3ds loader seems to double number
> of triangles - probably because of two sided material. So question
> number one - What is a two sided material and why it has to be
> duplicated, instead of just set to CULL_NONE ?
>
> But what really bugs me is what happens if I try to stripify the
> geometry. After stripification number of triangles increasted to 20813.
> Why ?
>
> And back to talk about GeometryInfo stripifier. After stripification
> average strip length is 4.118052. I hardly see it as a good result. If
> it is true that stripifier increased number of triangles to ease it's
> work, we would have about 2 triangles per strip in original model... I
> hope that just stat display is wrong - in other case we will have almost
> 2 times triangle count increase with amount of strips being equal to
> half of number of original triangles (after doubling by loader). Two
> triangle strips hardly look like a performance gain for me.
>
> Artur
>
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