Constraints in Houdini define how a piece of geometry behave and how they move in the simulation when external forces are exerted upon them. Glue & Spring Constraints both behave differently in the simulation.
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Destruction Simulations are controlled by the way you fracture the geometry being destroyed and how the glue constraints are to be broken on impact. Check out this video, where I covered the basics of setting up a destruction simulation using glue constraints provided by the voronoi fracture and I covered some basic concepts for glue constraints, to understand some fundamentals.
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