CGTalk How to animate feet (scripting) and have ground move same speed (no slipping)?
02-26-2017, 04:39 PM   #1
HarvestrX
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Join Date: Mar 2014
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How to animate feet (scripting) and have ground move same speed (no slipping)?

Hello all!

I am working on a project where I have to script the animation of a quadruped walk and run cycle. The walk cycle isn't hard, with a sin function for up and down motion and cos or -cos for the forward and back motion. Yet I don't get how to make the ground move with the feet at the exact speed they are moving. After all, if I assign a sin or cos function to the ground it will move back and forth, as it goes from 1 to -1 and back in a cycle.

Here is my code so far:

Quote:
 \$amp = 2; //controls height of foot during animation \$ampz = 3; //controls forward and back motion of foot during animation if(frame < 100) //speed up for 100 frames then stop, as a test to see the code is working \$speed = 3+time*2; else \$speed = 0; //this is to just test if they object will stop at frame 100, will later add in whatever the heck slows it down. \$footmove = \$ampz*cos(\$speed*time); //front foot \$footmove2 = \$ampz*cos(\$speed*time+3.14); //back foot \$footup = \$amp*sin(\$speed*time); //front foot y motion \$footup2 = \$amp*-sin(\$speed*time); //back foot z motion foot.translateX = \$footmove; if(\$footup >= 0) foot.translateY = \$footup; else foot.translateY = 0; foot2.translateX = \$footmove2; if(\$footup2 >= 0) foot2.translateY = \$footup2; else foot2.translateY = 0; ground.rotateZ = -1*(\$amp*\$speed*time*.43); /*ground object rotation (huge cylinder on side, so it can rotate and close up it looks flat*/

 03-04-2017, 12:01 PM #2 divitorobert Explorer portfolio   Join Date: Feb 2017 Posts: 14 this code for which game can you post more info than i can solved your problem share quote