Learning Houdini Journal 12: Fine Tuning the Car Impact
Staff Writer By: Ricky Grove (gToon)
This is the twelfth entry of what will be a year-long journal on learning the 3D application Houdini, created by Side Effects Software. Houdini is a sophisticated application that is widely used in the production of visual effects for Hollywood films such as Big Hero 6, Mad Max: Fury Road and many others.
In my previous Learning Houdini Journal 11, I discussed learning about bounce, friction and velocity as it pertains to dynamics animation inside of Houdini 15. In this journal entry, I'm taking this further and applying what I've learned to making the race car crash (from the Introduction to Houdini 15 tutorial I'm working my way through) more realistic by fine-tuning the animation.
Fine-Tuning the Ground Plane and Race Car's Parameters
Now it's time to experiment with degrees of velocity, friction and bounce to make the race car's crash through the window, arc through the air and then impact with the street below. All of the adjustments are general at first then more specific as I play back the animation to see the results. It all seems a bit clunky as it would be much simpler to make the adjustments inside the scene rather than in the parameters area. But this is nit-picking as the changes are quick and the animation is easy to reset.
Working with the instructor, John Moncrief, I adjusted the initial velocity to give a greater sense of push out of the window. After that I spent the most time getting the friction right for the ground plane as the increments had to be almost in the .001 amounts to get the right look. Angular velocity was adjusted as well in the Y and Z planes to get the car to move towards where the main camera would be.
The Bounce Issue
The adjustments I've made make the car's dynamic animation more realistic, although I'm certainly not satisfied. I think I've got to get the car's rear end to come down some as it's arcing in the air. Then the rear wheels hit first. This will take some more minute adjustments, but it's getting there.
Here's the embed of the video:
Next: Creating the Shattering Glass Window