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prevent division by zero in mass spring

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Xuchen Han
2019-08-20 16:26:19 -07:00
parent 7e971d9f63
commit fadf6aa612
1 changed files with 1 additions and 1 deletions
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2
src/BulletSoftBody/btDeformableMassSpringForce.h
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@@ -92,7 +92,7 @@ public:
// elastic force // elastic force
// explicit elastic force // explicit elastic force
btVector3 dir = (node2->m_q - node1->m_q); btVector3 dir = (node2->m_q - node1->m_q);
btVector3 dir_normalized = dir.normalized(); btVector3 dir_normalized = (dir.norm() > SIMD_EPSILON) ? dir.normalized() : btVector3(0,0,0);
btVector3 scaled_force = scale * m_elasticStiffness * (dir - dir_normalized * r); btVector3 scaled_force = scale * m_elasticStiffness * (dir - dir_normalized * r);
force[id1] += scaled_force; force[id1] += scaled_force;
force[id2] -= scaled_force; force[id2] -= scaled_force;