Light dots on my planes - where do they come from?

Get feedback from others on your works in progress
Post Reply
7 posts • Page 1 of 1
User avatar
Jardar
Posts: 14
Joined: Mon May 02, 2011 8:54 am

Light dots on my planes - where do they come from?

Post by Jardar » Fri Jul 22, 2011 1:35 am

Hi, guys!

I'm redoing this scene in Sketchup just for getting used to Indigo. The problem is mostly with the grey wall. At first, it looks 100% grey, but after rendering for some 5 minutes I start to get light brown dots all over the wall (and on the chairs too). What do they stem from? Is it reflections from something?

Some info on the materials if they help:
The wall and ceiling - 95% diffuse/phong blend with the same albedo. Diffuse has a slight bump (0,3 mm), phong has smoothness 50, IOR 1.33

The floor and the plywood wall - phong, smoothness 912, IOR 1.196

The door and frames - phong, smoothness 300, IOR 1.33

The chairs - phong, this material (http://www.indigorenderer.com/materials/materials/246)

The rest of the walls are Exit Portals.

Image

Image

User avatar
dcm
Posts: 663
Joined: Sun Jan 03, 2010 1:55 am

Re: Light dots on my planes - where do they come from?

Post by dcm » Fri Jul 22, 2011 2:17 am

use pathtracing not MLT

User avatar
Headroom
Indigo 100
Posts: 1058
Joined: Wed Aug 08, 2007 1:07 pm
Location: Spartanburg, SC, USA
Contact:

Re: Light dots on my planes - where do they come from?

Post by Headroom » Fri Jul 22, 2011 2:21 am

Those are reflections or "color bleeding".

Let it cook for for an hour (or a few hours) and the "spotty" appearance should disappear.

User avatar
Jardar
Posts: 14
Joined: Mon May 02, 2011 8:54 am

Re: Light dots on my planes - where do they come from?

Post by Jardar » Fri Jul 22, 2011 3:03 am

With path tracing (the first attempt was with MLT):

Image

It looked good till about 30 minutes in, then fireflies started appearing. Is this the same as color bleeding?

StompinTom
Indigo 100
Posts: 1828
Joined: Mon Sep 04, 2006 3:33 pm

Re: Light dots on my planes - where do they come from?

Post by StompinTom » Fri Jul 22, 2011 3:57 am

With Pathtracing, it starts to sample caustic effects and reflections, but it sucks at it, so you end up with little specks that take ages to resolve, if they ever do. I'd suggest BiDir + MLT and let it cook. The brown splotches are probably caustic reflections from the floor or walls.

User avatar
Jardar
Posts: 14
Joined: Mon May 02, 2011 8:54 am

Re: Light dots on my planes - where do they come from?

Post by Jardar » Fri Jul 22, 2011 3:58 am

Bidirectional Path Tracing seems to do the trick! 51 minutes, 340 spp. :D

Image

User avatar
dcm
Posts: 663
Joined: Sun Jan 03, 2010 1:55 am

Re: Light dots on my planes - where do they come from?

Post by dcm » Sun Jul 24, 2011 9:46 pm

if you want to get rid of fireflies, use higher Supersampling value (im uising 4 every time)

Post Reply
7 posts • Page 1 of 1

Who is online

Users browsing this forum: Yandex [Bot] and 34 guests