Character render problem

[borjalopez]

hello!
we have found a trouble whit render. the scene is very simple. One light , and ambient 0%. when the character have a bump maping the render have a problem.
See the images.

Thanks

[Jooa]

Are you saying that the shadow of the nose is too clean? Or...

[borjalopez]

when the character have a bump map in the sadow appears light

[Oracle77]

One idea: under global illumination, click 'Shading Noise Reduction'. This should stop the spots, and general brightness of the shadow. Hope it helps!

[JackDeL]

borjalopez,

Try what Oracle said first, but then check to see if you have a duplicate object. from the patch of grey in the left eye and the way the colors separate across the lips it almost looks like you have more than one head object there. the blue one, and a grey one thats slightly out of postion. check and make sure you are only dealing with one object.

Just my 2cents:)

good luck!:D

[borjalopez]

To better explain the rendering problem I reported before, I attach one new example. On the left side you can see the shadow map version (correct) and on the right side the ray tracing version (wrong).

There you can notice the marked area in red. Something like a black polygon is seen. The geometry is correct, but the shadow proyection is wrong in the ray tracing version (compare with the shadow map version, please).

I would appreciate your collaboration. Thanks a lot !!

[borjalopez]

I attach here the complete scene.
The problem appears when the scene is built using ray tracing and bump mapping. If these two options are not selected at one time, the problem does not appear.
Thanks again !

[fxnut]

Yep, I can confirm I'm getting the same, and it's nothing to do with non-planars, duplicate objects, etc. It's very strange!

What's even worse is if you turn the bump strength up to over 100% the shadow it casts on itself disappears entirely!! Check out the render below. Believe it or not raytraced shadows WERE turned on for this.

So unless I'm missing something too here, this is a definite candidate for the bug list.

[danilo]

Can we see wireframe?
danilo

[JackDeL]

borjalopez,

With raytrace on it seems to be working fine for me...very strange:confused:

[Rory_L]

I`ve been seeing Borjalopez`s rendering problem since LW 5.6. I never found a solution other than not to light models from the side! I`d really love to have someone from Newtek explain the reasons for this and any workaround...

Please??

R

[Rory_L]

Borjalopez, are you on a PC? JackDeL, at a guess ;) , is rendering on a Mac. I wonder if this makes a difference?

R

[borjalopez]

we have the same problem in mac computers

[fxnut]

JackDeL, did you have raytrace turned on at the render panel AND for the spotlight? Looks like you've still got shadow map enabled for the light.


I think I kinda understand what's happening with the bump. I started a thread on it here:

http://vbulletin.newtek.com/showthread.php?s=&threadid=11059

What I think is happening is that at glancing angles, the bump sticks out from behind the silhouette contour of the shape, and emerges from the shadow. When you turn up the bump to above 100%, it effectively sticks out even further and so it catches the light - despite the fact that the polygon might be facing away from the light. (Have a look at the picture below to see what I mean)

Note that this only happens on continuous mesh objects, i.e. you can pick one poly and be able to select the rest of the object by doing "select connected". So one solution might be to unweld some points in appropriate places. Might stuff up the smoothing though.

[JackDeL]

Originally posted by fxnut
JackDeL, did you have raytrace turned on at the render panel AND for the spotlight? Looks like you've still got shadow map enabled for the light.

Fxnut,

I double checked and you were right, I still had shadow maps on the light. after rendering with raytrace turned on, I got exactly the same rendering problem borjalopez described. :mad: :confused: :eek:

oh well. :(

Originally posted by Rory_L
Borjalopez, are you on a PC? JackDeL, at a guess , is rendering on a Mac. I wonder if this makes a difference?

Rory as I stated above once I rendered it correctly I got the same problem. But tell me, how did you know I was on a Mac?
:confused: :D

[Rory_L]

Jack, Haha!, Wheeze! Whoof! and generally LMAO...

Check out your tag-line!

JackDeL
Mac Addict


Sorry to disappoint, if you were starting to believe in ESP!

Cheers,

R

[JackDeL]

Originally posted by Rory_L
Jack, Haha!, Wheeze! Whoof! and generally LMAO...

Check out your tag-line!

JackDeL
Mac Addict


Sorry to disappoint, if you were starting to believe in ESP!

Cheers,

R

In the immortal words of Homer Simpson...
DOH!

I'm going home now.:D