View Full Version : Ncloth scene scale

 thehive03 March 2010, 03:08 PMhow can i make sure of my scene scale is correct for cloth sims, i know it has to be real world scale do i jus do it in feet or meters? thanks
Calibrix
03 March 2010, 04:21 PM
nCloth simulates in meters. But a fast way to check your scene scale is a "drop test". Get an object in the scene that you know it's size. Like a table or human character and simulate a piece of cloth dropping next to it. This let you preview how your nCloth behaves in the scene. If it falls to slowly your scene scale is too big and if it falls to fast your scene scale is too small. Scene scale doesn't need to be perfect, it just needs to work. I do this test every time I set up an nCloth solver and it's a great way to check your scene size.

thehive
03 March 2010, 04:29 PM
ahh ok, sounds great an simple. so once u know what the deal, do you scale up the characters or do u play with the nucleus space scale

Calibrix
03 March 2010, 04:39 PM
I change the nucleus space scale. This does not, however, scale the values for other nCloth attributes, like stretch resistance or damp. So values that worked fine at a scale of 1.0 need to be adjusted at a scale of 0.01.

thehive
03 March 2010, 05:06 PM
ahh ok thats what i figured cool deal

HowardM
03 March 2010, 05:17 PM

thehive
03 March 2010, 05:26 PM
Thanks Howard ill do that

YourDaftPunk
03 March 2010, 05:34 PM
Conversion formula to find the correct value for the nucleus Space Scale setting:

Convert to meters, divide by grid units:
R = your object's length in the real world (in cm, m, feet or inches)
M = your object's length in maya units (use the grid, distance nodes to find this)

if R is in cm:
(R * 0.01) / M = Space Scale

if R is in meters:
R / M = Space Scale

if R is in inches:
(R * 0.0254) / M = Space Scale

if R is in feet:
(R * 0.3048) / M = Space Scale

thehive
03 March 2010, 05:39 PM
oh this will help loads thanks really appreciate it

Castius
03 March 2010, 10:16 PM
The lift value does not scale with nucleus scale. This will drastically effect how cloth falls. It is very important to check. Even before you edit stretch and damp when your checking your scale values.

YourDaftPunk
04 April 2010, 03:47 AM
The lift value does not scale with nucleus scale.

I did not know that! Is that in all versions of Maya with ncloth?

Castius
04 April 2010, 04:21 AM
It still is in 2009 not sure about 2010.

Calibrix
04 April 2010, 12:15 PM
Thanks Howard, I had no idea my link was sending people no where. :D

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04 April 2010, 12:15 PM
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