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Rendering sharp Images for diagonal lines without jagged edges
Posted: 07 October 2008 07:23 AM   [ Ignore ]  
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I am pleased to see many experienced pros sharing this forum.
I have one question.
I am working on an industrial project with lots of diagonal lines and towers.
When I render .... the distant images look unsharp espcially the diagonal lines look bad (with jagged edges).
I tried rendering by changing antialias / sampling setup. There is no improvment.
Any suggestion???

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Dominic Ancelm
Riyadh
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http://www.deevista.com

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Posted: 07 October 2008 10:55 AM   [ Ignore ]   [ # 1 ]  
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Are you sure it’s the anti-aliasing’s fault?
Or is what you’re seeing actually the cross bars on the tracks sticking out?

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Posted: 07 October 2008 11:00 AM   [ Ignore ]   [ # 2 ]  
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Dom

What have you got the AA setting on ? I can’t replicate the problem you’re experiencing.

James

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Posted: 07 October 2008 01:58 PM   [ Ignore ]   [ # 3 ]  
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My guess is it’s related to the distance the far set of tracks is from the camera compared to the near set.  As Camera is rendering the scene, it will get much less information to work with from objects that are far away than ones up close.  Increasing the anti-aliasing level couldn’t hurt.  If the tracks are a texture map, increase the sampling level but be sure to check the sampling level for the group in question.  Even though you may set 16x16 in the render dialog, groups default to a maximum of 4x4.

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Posted: 07 October 2008 02:47 PM   [ Ignore ]   [ # 4 ]  
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Hi, Dominic

At least in first view your prob looks quite standard in 3D - simply you need to increase AA settings. There are 3 popups in Anti-Alias Tab (Render Dialog)

- “Anti-Alias Level”. It defines how many “sub-pixels” should be generated for each “final” (screen) pixel. The default 4x4 means 16. So if, for example, you render an image 640x480, really an image (640*4)x(480*4) is rendered, then “sub-pixels” are mixed together to produce a final 640x480 image. This setting is global.

- “Sampling level”. It’s a bit tricky, not a secret, but we aren’t sure we need to burden you with long tech explanations. Said shortly this popup defines how many “sub-pixels” should be really calculated (or otherwise - copied) to produce a “final pixel”. With high polygons density (like details in your example) every sub-pixel is calculated anyway regardless “Sampling level” value, so in your scene it looks not a prob. Note that “sampling level” can be overriden by same setting in Group Dialog.

- Anti-Aliasing. This popup defines how “sub-pixels” should be mixed together. “Adaptive” creates more sharp/contrast result.

Summary: first off set “Anti-Alias Level” to 8x8 and see. Then see difference between “Oversample” and “Adaptive” modes. Camera is a very suitable/responsible engine for tasks like this one. Good luck

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Posted: 07 October 2008 03:42 PM   [ Ignore ]   [ # 5 ]  
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Wow!!!!
Great replies........
Sure it helps me.........
Thankx for all

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Dominic Ancelm
Riyadh
Saudi Arabia

http://www.deevista.com

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