Forum: Blender


Subject: Layered Transparency problem

jspade opened this issue on Apr 04, 2014 · 6 posts


jspade posted Fri, 04 April 2014 at 10:20 AM

I'm having a problem with layers of glass. In the render below, the two windows just left of center are rendering as expected; you can see the skybox behind them. The other windows are not; they're showing solid white. This appears to be because they're behind another layer of glass (using the same Blender material); the same thing happens to the glass wall sections at the far left edge, when they're behind another glass wall section. The material settings are also in the screen shot.

I'm using Blender Render, with Ambient Occlusion & Indirect Lighting turned on Gather set to Approximate with 0.1 falloff.

Anybody know what's causing this and how I can fix it?

Glass render problem


heddheld posted Sat, 05 April 2014 at 5:47 AM

dont use BI much but try turning up your bounces


jspade posted Sat, 05 April 2014 at 3:46 PM

Attached Link: http://i.imgur.com/iNI4liW.jpg

![Fixed render](http://i.imgur.com/iNI4liW.jpg)That put me on the right track, thanks. Turned out what was needed was to turn up the transparency depth - 5 seems to do it.

Warlock279 posted Sat, 05 April 2014 at 3:55 PM

Yep, that's exactly what the problem is from the looks of it, you need to find and turn up the ray recursion limit. Looks like its on the "Transparency" panel, and the default appears to be "2" which means once a ray passes thru 2 layers of transparency it "runs out of energy" and just returns the constant value, which in your case is white. If you set that value higher, it should solve the problem, you don't want to set it too high tho, as it will likely increase your render time slightly. 

 

Also, keep in mind, a similar issue, tho often less noticeable can happen when you have multiple refelctive surfaces on the scene together. There's a depth limit on the "Mirror" properties panel as well, you might want to increase that if you notice reflections are "running out" as well.

 

Where on earth did you get a monitor which a resolution of 2800x1800 pixels by the way???

 

 

EDIT: Whoops, looks like we crossed up while i was poking around blender for the right buttons to push.

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LaurieA posted Sat, 05 April 2014 at 4:26 PM

Sounds like a Mac retina display.

Laurie



jspade posted Sat, 05 April 2014 at 8:14 PM

Quote - Sounds like a Mac retina display.

Yup.

And thanks all. I'm still a n00b, but I'm learning fast.