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TenPix Cloth

Chapter 5 · Workflows

5.7Tearing

Tearing along a painted region

  1. Paint the region that may tear in a Tnpix Channel, or draw the exact line with the channel's Tear brush.
  2. Add Tnpix Tear, set Tear by to Map and choose the channel.
  3. Play and read the status line: it shows the strongest pull reached. Set Threshold just below that value to tear there. Lower tears sooner and more; higher holds longer.

Tearing by stretch

Set Tear by to Stretch to let the cloth tear anywhere an edge grows beyond the Stretch ratio: 0.1 tears at 10 percent longer. No paint is needed; a painted channel with Weakness max above 1 makes its region tear sooner, point by point, with each painted point's own weakness between Weakness min and Weakness max.

A seam that rips first

Combine two Tears: a Stretch Tear for the whole cloth and a Map Tear with a low Threshold on the painted seam. A point both mark keeps both tests and tears at whichever limit it reaches first, wherever the two sit in the stack.

Bursting under pressure

Add Tnpix Volume in Pressure mode to a closed shell, paint the region that should burst, and add Tnpix Tear with Tear by Pressure. The region bursts when the pressure passes the Threshold.

Threads at the tear

  1. Add Tnpix Threads directly above the Tnpix Solver of the tearing cloth.
  2. Set Warp every, Weft every and Thread length for the weave you want, and play from the first frame: the threads grow out of each crack as it opens.
  3. Choose the thread's Material; raise Warp holds and Weft holds for more threads spanning the crack, or set one family to 0 for ripped denim.
  4. For dense threads, keep Viewport % low while you work: the render makes every thread.
  5. Click Make the threads object to give the threads their own material, and cache that object when the shot is approved.

The Tearing Sample on the TenPix toolbar builds a complete tearing scene to start from.