• Maxon Cinema 4D

  Curtain problem

  Posted by Richard Quinn on August 10, 2009 at 8:37 am

  Hi,

  I have spent most of my weekend trying to animate a pair of curtains and its Monday morning and I can’t believe I am still trying.

  Could someone please help. I have the curtains drawing back on the 50 frame mark using belt tags attached to invisible objects. The pulling back seems fine but I just cannot stop the curtains billowing upwards at the beginning.

  I am trying to achieve the look of heavy stage curtains. At the moment it is acting like thin silk.

  If anyone can tell me where I am going wrong you would make me a very happy man!

  Here is the project file.

  Cheers,

  Rich

  Richard Quinn replied 16 years, 9 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Adam Trachtenberg

  August 10, 2009 at 11:20 pm

  What’s happening is that the belted points are jumping to a different location at the first frame, which is causing the curtains to billow out. I don’t know how that happened, but you can correct it by going into each of your belt tags and resetting them (just click the appropriate point and then hit the set button).

  A few other observations:

  * you have subdivision set *very* high — the cloth nurbs is subdiving once, and then that subdivision is being subdivided twice more by the HyperNurbs object in the editor, and three times for the renderer. In effect you’re taking the number of polygons in the object and multiplying them to the fourth power. That’s creating over 600,000 polygons which will slow things down considerably. I’d suggest subdiving once in the CN object and once in the HN object.

  * you have quite a few disconnected points on the curtain geometry, which is caused by selecting and deleting polygons. You can remove them by running the functions>optimize command. If you do that, do it before you reset the belt points or you’ll have to reset them all over again.

  * you can reduce the curtains bounce and get a more controlled simulation by adding a tiny bit of global drag in the cloth tag’s forces tab (just around 1-3%).

  hth
• 

  Richard Quinn

  August 11, 2009 at 12:55 pm

  Hi Adam,

  Thanks so much for all the tips and pointing out what I should have noticed – the belt tags moving in the Z axis!!

  My curtains are now a lot happier.

  Thanks again,

  Rich

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