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spacedrive · 08-10-2003, 03:58 PM

I'm attempting to build this spaceship and I've ran into all kind of problems. It's curved surface is creating all kinds of strange effects when I render it. I've resolved a few of the problems I've encountered, but this latest one has me stumped, when I turn on the render shadows option I get a lot of these ugly triangles. It doesn't do it with the render shadows option turned off.How do I defeat this?

Hopefully this pic link works:

Johnny9ball · 08-10-2003, 05:44 PM

Have you checked for non-planar polys?

spacedrive · 08-10-2003, 07:04 PM

Hmm, no. How do I check for those? I'm a novice at this.

Mark · 08-10-2003, 07:08 PM

Hmm... Well, I don't have LW in front of me right now, but if I remember correctly, then the polygon statistics panel (^H, W) will show any non-planar polys.

You have four options to try and eliminate them:

1. Manually adjust points to make them planar.
2. Convert the object to subpatches
3. In the surface editor, change the max smoothing angle
4. Triple all 4 or greater point polys.

spacedrive · 08-10-2003, 07:53 PM

Thank you very much! I had 190 non-planars and I tripled them all and it went away. That was so easy, but I was stopped cold on that problem. It renders perfectly now.

Mark · 08-10-2003, 08:08 PM

No problem. That's what we're all here for.

Johnny9ball · 09-10-2003, 01:27 AM

Ya always watch out for those ugly non-planers there your first suspect in rendering anomalies.

R4s1n · 09-10-2003, 03:11 AM

if u can , try to post the final render with the nonplanar polygons gone

Leovenous · 09-10-2003, 03:23 AM

I am up against some nasty non-planar issues myself right now. Only I resist the idea of tripling them for various reasons. Mostly because I am trying to keep it real clean.

Spacedrive: Was the triple thing clean enough? Could you maybe post a shaded wireframe for me to see?

Nice ship BTW.

spacedrive · 09-10-2003, 01:18 PM

I was pretty pleased with the results:

Now I have to do some major texture maps to complete it.

I don't know if it would be clean enough if you were doing precise, close-up renders, but this was more than good enough for my purposes as this is as close as I'm going to get to the model in my scene.

Mark · 09-10-2003, 05:25 PM

Looks pretty good so far.

08-10-2003, 03:58 PM	#1
spacedrive Registered Member Join Date: Sep 2003 Posts: 18	Strange Shadow Errors I'm attempting to build this spaceship and I've ran into all kind of problems. It's curved surface is creating all kinds of strange effects when I render it. I've resolved a few of the problems I've encountered, but this latest one has me stumped, when I turn on the render shadows option I get a lot of these ugly triangles. It doesn't do it with the render shadows option turned off.How do I defeat this? Hopefully this pic link works:

08-10-2003, 05:44 PM	#2
Johnny9ball Super Moderator Join Date: Jan 2003 Location: Reno,Nevada Posts: 1,099	Have you checked for non-planar polys? __________________ www.ThreeDCG.com

09-10-2003, 01:27 AM	#7
Johnny9ball Super Moderator Join Date: Jan 2003 Location: Reno,Nevada Posts: 1,099	Ya always watch out for those ugly non-planers there your first suspect in rendering anomalies. __________________ www.ThreeDCG.com

09-10-2003, 03:11 AM	#8
R4s1n Full Access Member Join Date: Aug 2003 Location: Manchester, PA Posts: 1,319	if u can , try to post the final render with the nonplanar polygons gone __________________ Johnny was a chemist's son, but Johnny is no more. What Johnny thought was H2O was H2SO4.

09-10-2003, 01:18 PM	#10
spacedrive Registered Member Join Date: Sep 2003 Posts: 18	I was pretty pleased with the results: Now I have to do some major texture maps to complete it. I don't know if it would be clean enough if you were doing precise, close-up renders, but this was more than good enough for my purposes as this is as close as I'm going to get to the model in my scene. Last edited by spacedrive; 09-10-2003 at 03:11 PM.

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08-10-2003, 07:04 PM	#3
spacedrive Registered Member Join Date: Sep 2003 Posts: 18	Hmm, no. How do I check for those? I'm a novice at this.

08-10-2003, 07:08 PM	#4
Mark Super Moderator Join Date: Jan 2003 Location: Sunbury, UK Posts: 2,339	Hmm... Well, I don't have LW in front of me right now, but if I remember correctly, then the polygon statistics panel (^H, W) will show any non-planar polys. You have four options to try and eliminate them: 1. Manually adjust points to make them planar. 2. Convert the object to subpatches 3. In the surface editor, change the max smoothing angle 4. Triple all 4 or greater point polys.

08-10-2003, 07:53 PM	#5
spacedrive Registered Member Join Date: Sep 2003 Posts: 18	Thank you very much! I had 190 non-planars and I tripled them all and it went away. That was so easy, but I was stopped cold on that problem. It renders perfectly now.

08-10-2003, 08:08 PM	#6
Mark Super Moderator Join Date: Jan 2003 Location: Sunbury, UK Posts: 2,339	No problem. That's what we're all here for.

09-10-2003, 03:23 AM	#9
Leovenous Full Access Member Join Date: Jun 2003 Location: Oregon Posts: 367	I am up against some nasty non-planar issues myself right now. Only I resist the idea of tripling them for various reasons. Mostly because I am trying to keep it real clean. Spacedrive: Was the triple thing clean enough? Could you maybe post a shaded wireframe for me to see? Nice ship BTW.

09-10-2003, 05:25 PM	#11
Mark Super Moderator Join Date: Jan 2003 Location: Sunbury, UK Posts: 2,339	Looks pretty good so far.

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