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eko

How to get correct Motion Blur

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Hi,

This problem is bothering me for quite a while.if I have a sphere which is moving fast together with camera. So the sphere is static relative to the camera. but the transformation of sphere is at the Sop level but the camera motion is at the Object level. so the motion blur is wrong.

you can find the result from the pictures below. the red sphere is moving together with camera. the white small sphere is not moving. when I put the tansformation of sphere at the Object level. I got the corrent motion blur. but it's not always easy to extract the transformation from deforming object.

Anyone have other solution? thanks

1.Wrong motion blur

wrong_mb.jpg

2.correct motion blur

correct_mb.jpg

3. no motion blur

no_mb.jpg

mb_test.hip

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For Deformation Motion Blur (stuff happening in SOPs), you have to set "Geo Time Samples" to at least 2 on the Mantra ROP.

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On 6/2/2020 at 1:50 PM, Skybar said:

For Deformation Motion Blur (stuff happening in SOPs), you have to set "Geo Time Samples" to at least 2 on the Mantra ROP.

I have another question. the geometry deforming works fine when GeoTime samples is set to at least 2. but  how about volume . I convert the red ball into volume and Motionblur is not correct.

wrong_volume_mb.jpg

Edited by eko

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17 hours ago, eko said:

I have another question. the geometry deforming works fine when GeoTime samples is set to at least 2. but  how about volume . I convert the red ball into volume and Motionblur is not correct.

 

For most volumes you will need a velocity volume and use velocity blur. For this case you could also create the volume -> pack it (Pack SOP) -> then move it with a Transform SOP. The transformation data will then be on the packed object and it will blur correctly. 

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3 hours ago, Skybar said:

For most volumes you will need a velocity volume and use velocity blur. For this case you could also create the volume -> pack it (Pack SOP) -> then move it with a Transform SOP. The transformation data will then be on the packed object and it will blur correctly. 

That make sense! Thanks a lot David!

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