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Dark Bands in Forest Lite render
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Topic: Dark Bands in Forest Lite render (Read 8065 times)
jona
Newbie
Posts: 32
Dark Bands in Forest Lite render
«
on:
July 25, 2011, 10:14:39 PM »
I am using Mental Ray and I have a forest object in most of the scene. In the middle of the frame I have an unusual dark vertical band that has pretty straight lines. Towards the rear of the frame it gets lighter but in the foreground it is just a band of darker imagery than the rest of the shot.
I fooled around with the shadow accuracy but that doesn't seem to solve it.
I am using a mesh object as the master.
I am using Mental Ray and Max 2011 .
In the pic.. those dark areas resolve to very straight lines when the field is highly populated. You can see the line is very straight on the right side. There is a sudden change of color.
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Last Edit: July 25, 2011, 11:41:51 PM by jona
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iToo
Administrator
Hero Member
Posts: 4595
Re: Dark Bands in Forest Lite render
«
Reply #1 on:
July 25, 2011, 11:42:09 PM »
Are you using billboards ? Probably the light is hitting the planes on different angles, since they are rotated to face the camera.
Please, upload a test scene and we will check it.
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Carlos Quintero
iToo Software
jona
Newbie
Posts: 32
Re: Dark Bands in Forest Lite render
«
Reply #2 on:
July 25, 2011, 11:44:08 PM »
Hi Carlos.
I am using a mesh object but I have the scene set to automatic. Really need help on this one.
The scene is a proprietary shot for my client. Can I upload to you safely?
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daniel
Newbie
Posts: 1
Re: Dark Bands in Forest Lite render
«
Reply #3 on:
July 26, 2011, 10:01:54 AM »
We checked the scene and this don't seems to be a problem of shadow or render settings, instead it is a problem related with the angle of the light and the regular distribution of the leaf bunches. Please try the following changes:
To eliminate or disimulate the straight lines, add ramdomness to rotation and displacement to the elements, you can also use a less dense distribution map with a smaller area (to completly avoid patterns you can use a random map instead textures).
For the disimulate the shadow bands, change the angle of the light and add ramdom rotation to the elements.
Change the rectangular shape of the bunch for a circular or more random form, this will help to reduce even more the emergence of patterns.
Please tell me your results.
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jona
Newbie
Posts: 32
Re: Dark Bands in Forest Lite render
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Reply #4 on:
July 27, 2011, 02:01:55 AM »
The problem I am having when I use random rotation is I will see plants inside of areas which they are not supposed to be. I have a set of splines defining the area and without random rotation the plants are not placed inside of splines defining empty areas. When I turn random rotation on they traverse these areas that are supposed to be empty.
UPDATE: D'oh! I found the Boundary check control that uses the size instead of the pivot point! Sweet!
Thank you itoo for your kind support of a free plugin. That is rare.
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Last Edit: July 27, 2011, 04:16:54 AM by jona
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