Why topology 3D model is deforming in animation?

Topology 3D models deform in animation usually because poor edge flow, uneven polygon distribution, or misaligned loops prevent vertices from moving naturally with the model’s motion. Good topology follows the model’s intended movement (like joint bends or muscle lines)—bad topology (e.g., triangles in high-movement areas like elbows) disrupts how vertices shift, causing unnatural stretching, folding, or tearing. If your model deforms, adjust edge loops to align with movement paths (e.g., around eyes or knees) and replace triangles with quads; tools like Blender’s Loop Cut or Maya’s Edit Mesh can help refine topology for smoother deformation.