Indigo Renderer Forum

Hi all, Hi Nick,

while optimizing my exporter i came across some bumpmapping bugs..



From left to right specular diffuse plastic metal

when taking a closer look there seem to be two bugs..

(1) The bumpmapping of the specular material seems wrong most visible on the sphere and the plane

(2) The smoothing seems not to be working correctly most visible on diffuse and plastic... you can see the faces there

OK hope this helps here is the scene...

Download Scene

cheers

u3dreal

u3dreal i can see your image or download the scene...please check the links...thnx

Thanks u3dreal,
the bump mapping /shading normals bug is a known problem.
Not sure about the other one, it's kinda hard to see what the problem is in your image.

Ok the first one is most visible here



the mapping seems to be applied in two directions z and y ...
You can see this on the two circles one at the top of the sphere and another one on the front ... also the mapping of the plane and the
box seem to be strange the plane is only in x direction not in z as it should ..on the box you can see that there are no squares on the frontside only lines ...

here is an image where i tried to mark the points...



hope it's getting clearer now...

The link for the scene should also work now maybe you can get the clue from there ..

i will try to make a closeup of the sphere maybe without transparecy..

cheers

u3dreal

wait... specular materials can have a bump map now?

yes tom
makes a lot of noise however

siiiick... i was supposed to do some work today but... [boots blender].

ok u3dreaL now i see your pics.....thnx!

Ok here it is pretty obvious that something is wrong with the specular bump..



both spheres have the same mapping and bumpmap..
actually they are copys..

Although it is different right now...

cheers

u3dreal

PS Nick if you need the scene let me know..

its a known bug u3dreal.....bump map kills smooth...

Kosmokrator wrote:its a known bug u3dreal.....bump map kills smooth...

Not the smoothing problem... isn't bump map different form the diffuse ?????? Is this really so hard to see...OK

Here is the same scene with plastic material ..



Obviously the bump looks a little different from the specular..
agree ???

The smoothing problem only seems to be in the diffuse code..as the pure phong with black diffuse renders fine....

The small facets are in the bump map so this is correct..

Nick you agree ??

cheers

u3dreal

Let me explain in more detail...
When bump mapping is enabled, the underlying, pre-perturbed normal used is the geometric normal. The shading (interpolated) normal is not used.
This is incorrect, and will be fixed at some point.

oohh yes u3dreal....now i catch it!im sorry.....

nick yes please fix this micro-bugs....

yes i can see it too, the uv-coords for bump-map on specular materials are wrong / lost

OK

thanks guys..

cheers

u3dreal