Angular map in cycles - camera location #42309

New Issue

Ricky J · 2014-10-20T15:10:56+02:00

Ricky J commented

2014-10-20 15:10:56 +02:00

win 8.1
video : HD8670 D

blender : # 95182d1
last official version

pack file sample
http://www.pasteall.org/blend/32106

if I set the camera in front it renders blurred and distorted !

if I set the camera in the back then it works fine!

so is this a bug or normal behavior?

for pictures/discussion see thread here
http://blenderartists.org/forum/showthread.php?351741-cycles-sky-map

I did check wiki but did not see any note on this distortion with camera in front

if it is normal behavior then may be some note should be added to warn peoples!

thank you
happy bl

win 8.1 video : HD8670 D blender : # 95182d1 last official version pack file sample http://www.pasteall.org/blend/32106 if I set the camera in front it renders blurred and distorted ! if I set the camera in the back then it works fine! so is this a bug or normal behavior? for pictures/discussion see thread here http://blenderartists.org/forum/showthread.php?351741-cycles-sky-map I did check wiki but did not see any note on this distortion with camera in front if it is normal behavior then may be some note should be added to warn peoples! thank you happy bl

Ricky J commented

2014-10-20 15:10:56 +02:00

Changed status to: 'Open'

Ricky J commented

2014-10-20 15:10:56 +02:00

Added subscriber: @rickyblender

Sergey Sharybin commented

2014-10-21 09:55:59 +02:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2014-10-21 09:55:59 +02:00

Sergey Sharybin self-assigned this 2014-10-21 09:55:59 +02:00

Sergey Sharybin commented

2014-10-21 09:55:59 +02:00

It seems you've just scaled the jpeg image down quite dramatically, when using angmap12.jpg from your file i don't see artifacts. Plus jpeg is a lossy file format, it only preserves human perception, using it as a sky texture might give artifacts just because of lack of the precision in the format. Also scaling textures down reduces the precision of the texture.

If you use, say, generated texture of the same size then you wouldn't see any artifacts just because the generated image was never saved to the lossy format.

Thanks for the report, but i don't see a bug in here, just a bad texture.

It seems you've just scaled the jpeg image down quite dramatically, when using `angmap12.jpg` from your file i don't see artifacts. Plus jpeg is a lossy file format, it only preserves human perception, using it as a sky texture might give artifacts just because of lack of the precision in the format. Also scaling textures down reduces the precision of the texture. If you use, say, generated texture of the same size then you wouldn't see any artifacts just because the generated image was never saved to the lossy format. Thanks for the report, but i don't see a bug in here, just a bad texture.

Ricky J commented

2014-10-21 13:35:46 +02:00

I can understand that pic size influence the quality
the bigger the better!

but how do u explain the fact that if camera is located in front the render is mostly distorted
but if you locate camera in the back the render looks very nice?

thanks &
happy blendering

I can understand that pic size influence the quality the bigger the better! but how do u explain the fact that if camera is located in front the render is mostly distorted but if you locate camera in the back the render looks very nice? thanks & happy blendering

Sergey Sharybin commented

2014-10-21 14:09:15 +02:00

Just sample pattern might vary and run into correlation with the lossy pixels in the texture.

Ricky J commented

2014-10-24 14:44:56 +02:00

I re check some old files in Bl 2.6 for angular and sky map
and I can locate the camera anywhere
it always render well !

but this does not seems to be the case using cycles!

only works when camera is in the back not the front

so was wondering if this was not a bug or normal!

may be someone should add this constraint in the cycles wiki pages!

thanks
happy blendering

I re check some old files in Bl 2.6 for angular and sky map and I can locate the camera anywhere it always render well ! but this does not seems to be the case using cycles! only works when camera is in the back not the front so was wondering if this was not a bug or normal! may be someone should add this constraint in the cycles wiki pages! thanks happy blendering

Sergey Sharybin commented

2014-11-04 18:20:33 +01:00

Just sampling happens different in BI and Cycles. Depending on the particular noise on the image it might not work from the "outside" as well.

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Angular map in cycles - camera location #42309