physically correct ?

[Phil]

Hello,


can someone tell me if this is a bug?




The black border does not seem ok for me.

Regards

Phil

[skypa]

I'd say those normals are facing the wrong direction. I don't know what modeler you use, but try flipping all normals to the outside.

[Phil]

Thanks skypa,

I will check the normal this evening, but I don´t think they are wrong.
I use Pro/Engineer as modeller and than I export in obj, then Blender and then Indigo.
For me it could be a shadow, but it really looks strange.
The 2 parts have nk material and are very reflective, could this be a problem?
I wil ljust try to render the picture longer, perhaps this will help.

regards, Phil

[atmmatt]

Have you tried rendering it in blender and seeing if the same problem is there?

Also which two nk files did you use?

[Lotuspec]

You could also try to render it with a diffuse material or other light conditions to see whether it is a normal or lighting (shadow) problem.

[m1j]

[quote="Phil"]Hello,


can someone tell me if this is a bug?


[img]http://img62.imageshack.us/img62/1700/test1xt2.png[/img]

The black border does not seem ok for me.

Regards

Phil[/quote]


Is there a space between the mirrored disk and the mirrored support brackets? If there is a space then the dark area may be the space not getting light. Or reaching the max bousnce amount. Just a thought. Us a diffused surface to see what that looks like.

[Phil]

Hi m1j,

yes theres is a space, I am just investigating this.
What do you mean with "reaching the max bousnce amount"

@ all, is in indigo the same problem like in povray when we have too much reflective surfaces?

regards, phil

[Phil]

Hi,

I made some new render, and I changed the material bracket.

in the first picture the material were:

<phong>
<nk_data>nkdata/Al.nk</nk_data>
<exponent>4000</exponent>
</phong>

for the bracket and

<phong>
<nk_data>nkdata/Cr.nk</nk_data>
<exponent>9000</exponent>
</phong>

for the wheel

Now I changed the bracket material in:
<phong>
<diffuse>0.7 0.7 0.7</diffuse>
<specular>0.149 0.149 0.149</specular>
<fresnel_scale>0.800</fresnel_scale>
<exponent>320.000</exponent>
</phong>

Here is the result



Now I can clearly see that there is a shadow, it is not black anymore.

It is a bit difficult to find the good parameters.

Thanks for you reply,

Phil