Apply motionblur except position value

Krakatoa for 3ds Max
1

Hi~ I want to make tornado effect with karakatoa
There is a problem to apply motionblur Because of position value
How can i apply motionblur except position value.
is there any way to use kcm?

2

Hi!

I am not sure I understand your question.
Can you explain again with different words?

To render motion blur, you obviously need both Position and Velocity values.
As result, the Position of the particle will be changed over time to produce the blur.

Cheers,
Bobo

3

hi~ bobo. thanks for reply.
The problem is emitter source’s position value is much higher than rotation value. so it looks weird. I just want to make twist effect regardless emitter’s movement.
In other words, what I want to do is only emitter’s rotation values make motionblur.

4

Unfortunately, there isn’t much you can do since Krakatoa does motion blur only from Position changes. The Rotation (Orientation, Spin) of particles does not affect Krakatoa rendering at all unless you are using the Normal channel for reflections or specular highlights.
Even if you think that a Vortex space warp applies a rotation, it does not. It applies a varying velocity vector on each integration step, but it changes the Position of the particles, not their rotation. So if you are doing a tornado, you are moving particles around, not rotating them. The only thing you can do is tweak how much Motion Blur you are getting - either by tweaking the Shutter Angle, or by using a KCM to scale the Velocity value.

5

Thanks a lot. By tweaking the Shutter angle, I could get bettter result.