Breaking the Stone by Ashish Rastogi, India

Step 4: But when you move the parts then you will see from inside the boxes are hollow and when they break then not looks good or say nothing is visible. So, now we will create the inside polygons. First hide the other detach polygon. And start working on the other one. Select some inside vertexes and duplicate them by pressing the Shift key and move the vertexes.


Step 5: Go into the polygon mode and click on Create button. Now start clicking on the vertexes and polygon on those vertexes will be created. Remember on vertex where you click first, at the same vertex you need to click at the end to create polygon and don’t create polygon by choosing more than 3-4 vertexes. Same procedure need to follow on the other part.


Step 6: After creating the inside polygons your main part is completed. Rename all the parts. And create a plane in the scene to collide. From the reactor rollout create a RB Collection and Fracture Solver. Add all the objects in a scene to RB Collection and all the stone fragments into the Fracture.


Step 7: Go into the Utility>Reactor. And in the Reactor properties change to “Use Mesh” for the plane in the Concave Rollout. And also give different masses to different stone pieces so all of them behave differently.


Step 8: Click on the Preview Button in the Reactor Preview & Animation panel. And if you are satisfied with the results then you can click on Create Animation button. Now all the animation key frames will automatically created according to the preview you have seen. When you watch the timeline then key frame will be created on every frame which is useless and very cumbersome if want to change any animation. So, into the Utils rollout and under Key Management click on Reduce Now with threshold to 0.5.


For texturing apply a UVW mapping and select Box in the mapping coordinates. If the object is too complex and break seams are shown then duplicate the object in starting and select Acquire in the UVW mapping alignment dialog.

Hope you enjoy this small tutorial. If you want to show many small chunks in the air then you can also use a Particle Flow and on collide emit the custom object instances.


This tutorial was first published in the CGArena Free PDF Magazine December 06 Issue. Download your copy now

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