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Old 09-18-2012, 02:15 AM   #1
marckury
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Marc Gibert
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motion vector in nuke

hi! well its strange I cant see here any topic about this ... searching on the net I saw about my problem and even some solution but seems not for me... :(
well I just rendered the motion pass in maya mental ray , and in digital fussion works perfect , nice blur , but in nuke have lot of artifacts , and when dont need any special setup...just plug mv pass in the vector blur node of nuke and activate the alpha to premultiply...but nothing ... i can see the effect but horrible looking! , just cant understand whats happening and more when in digital fussion is the same conection but works like a charm......
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Old 09-18-2012, 09:17 AM   #2
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michael vorberg
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could you show how you do it in nuke and what the result looks like?
 
Old 09-18-2012, 10:49 AM   #3
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ok i did this , left fusion with easy nice soft blur , right.. nuke with almost soft blur with black background but anyways can see alpha too hard , but if I want change background color to other like white then get horrible , its just couple connections I dont know what im doing bad
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Old 09-18-2012, 07:21 PM   #4
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your setup looks right

only thing i can imagine is that somethings get messed up via the sRGB conversion in the read node. cant tell you from my memory if this works on all channels or just the RGB. if its converting every channel into sRGB then you vector pass will be wrong.

and also as a side note: the sRGB to linear conversion in the read node clips values above 1 and under 0. its better to use a colorspace node right after the read
 
Old 09-18-2012, 09:09 PM   #5
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yes thanks for the way to take , i just checked the "viewer process" which on default is in sRGB , if i change that to none...then the blur looks better , so seems should change the vector pass to other color space or the alpha , since the bad thing alpha is too hard .....but im tweaking with that nodes and cant get anything similar like changing that viewer process from sRGB to none....
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Old 09-18-2012, 09:09 PM   #6
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