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JLyddon

DOPS Simulation Scale issue

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I'm currently working on my major project where we have lots of destruction. We are working in centimeters for this project, however when I use DOPS, it seems to be evaluating everything in metres no matter what scale I change it to.

 

For example:

Houdini's units = 1 metre

Sphere radius = 0.25 metres/units

Height dropped from = 1 metre/unit

When running this in DOPS, the ball hits the floor in half a second, which compared to my reference seems like the correct velocity, great!

 

When I change the parameters to

Houdini's units = 0.01 metres

Sphere radius = 25 centimetres/units

Height dropped from = 100 centimetres/units

The ball drops as if it is in slow motion, although it seems to still be evaluating in metres.

Any ideas as to how to change the simulation "scale" so that I don't have to scale everything down by 0.01, and then scale it back up. Thanks very much in advance :)

Edited by JLyddon

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Are you changing the unit length in preferences? I think you need to do that before creating the dopnet and everything, I'm not sure.

 

You could just mult up the gravity (and other forces) by 100, giving you the right scale without having to scale down/up your geo.

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You are absolutely right Skybar, I just figured that out as soon as you posted. The scaling needs to be applied before the creation of the network. I just tested having it in centimetres and creating a network, and then making it metres and creating the network and putting the same object in both and they simulate differently. Thanks for your response :)

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You are absolutely right Skybar, I just figured that out as soon as you posted. The scaling needs to be applied before the creation of the network. I just tested having it in centimetres and creating a network, and then making it metres and creating the network and putting the same object in both and they simulate differently. Thanks for your response :)

 

 you also might just consider scaling down before the dopnet, and scaling back up afterward.  It's 2 transform sops.

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i've found a lot of problems in dops with non-meter scale... simple stuff seems to work, but some of the more complex shelf tools don't...

 

always a good idea to try an example in meter scale first to see what it *should* look like before throwing it in cm scale....

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