Macha Posted January 16, 2012 Share Posted January 16, 2012 (edited) I have a fast moving object, and a fast moving camera, and all sorts of fast moving things in all sorts of object/world/blabla spaces that confuse me. What I want is a vector that, when seen through the camera in the viewport, will give me a correct indication of how strong the motionblur will be in the render. Sounds easy, but I can't figure it out. It's not plain vanilla v, that much I have figured out. How would I do that? Is it the difference of camera v and object v (both in worldspace) times camera shutter time or something like that? Edited January 16, 2012 by Macha Quote Link to comment Share on other sites More sharing options...
Fabiano Berlim Posted January 16, 2012 Share Posted January 16, 2012 If you have an object with velocity as one in Houdini, means that the object will move one unit in one second. With fps 24 your object will move roughly 0.04, but it will only be exposed half of this movement with shutter 0.5. So... In the end your motion blur will be 0.02. Minus camera movement with all this math applied to it. ((Object_Velocity/Fps)*Shutter)-((Camera_Velocity/Fps)*Shutter)) Two setups to show the concept -> velocity_and_motion_units.hip Cheers! Quote Link to comment Share on other sites More sharing options...
hopbin9 Posted January 16, 2012 Share Posted January 16, 2012 @Fabiano awesome. thanks. Now I know later I'll need this, but won't remember where I read it. Quote Link to comment Share on other sites More sharing options...
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