How to Fix Strange Deformations When Using Biped in 3ds Max

Published on January 06, 2026 | Translated from Spanish
Side-by-side comparison: correct vs incorrect deformation on a character with Biped, showing weight adjustment panel

When Your Biped Turns Your Character into a Failed Experiment ๐Ÿงช๐Ÿ‘พ

You've placed the Biped, animated with enthusiasm... and now your character looks like it's melting. Don't worry, it's not black magic, you just need to master the art of weights and envelopes.

๐Ÿ” Quick Diagnosis: Why Does This Happen?

๐Ÿ› ๏ธ Step-by-Step Solution:

  1. Perfect Alignment Pre-Animation:
    • Place the Biped in a T-pose (arms extended)
    • Ensure each bone is inside the corresponding mesh
    • Don't skip this step! It's 50% of the success
  2. Properly Configured Skin/Physique:
    • Apply the Skin modifier to your mesh
    • Add all bones from the Biped
    • Alternative: Use Physique with Attach to Node
  3. Fine-Tuning Envelopes:
    • Activate Envelope Properties
    • Adjust Inner and Outer radii
    • Try using Rigid Falloff for clean transitions
"A well-adjusted envelope is like a good hug: not so loose it falls off, nor so tight it suffocates"

๐ŸŽจ Painting Weights Like an Artist (With Suffering)

๐Ÿšจ Express Solutions for Disasters:

๐Ÿ’ก Professional Tip:

Before complex animation, test with:

  1. Simple arm flexion
  2. Head turn
  3. Torso bend

This way you detect problems early.

Remember: even the best artists spent hours adjusting weights. Your character will stop looking like a lab experiment... eventually. ๐ŸงŸโžก๏ธ๐Ÿ•บ