Saturday, February 16, 2008

Rigid Body Physics #4

hi, last weeks i created the physics engine with general constraints, and i though it will be fun to play with them a little, so i added more constraints to the system so i could build more complex systems with it.
the constraints the system support:
1. ball and socket - constraint two bodies to one common point
2. body to body - constraint point on one body to a point on another body
3. body to body with distance - same as 2 but maintain a specific distance between the points
4. body to world - constraint point on a body to be fixed on specific world position
5. body to plane - constraint a body to move inside specific plane
6. body to line - constraint point on a body to move along specific line
7. hinge - constraint point on one body to a point on another body along specific axis with angle limits.
8. universal - same as 1 but constraint an extra degree of freedom, if we specify one axis on body0 and another axis (perpendicular to the first axis) on body1 it keeps them perpendicular.
here is few movies that demonstrate few of the constraints in action:
NOTE: the movies captured in debug mode of the physics system so you'll see some lines and spheres that shows constraints info.

body to line

body to plane

body to world position

body to body


Saturday, February 2, 2008

Rigid Body Physics #3

hi, still working on rigid body physics (not an easy task).
i have finished few constraints, (ball & socket, hinge and universal) fixed some collision bugs, improve stability and collision system.
with the new constraints i could start creating rag dolls (maybe next time),
to test the constraints i created simple rope simulation using few universal constraints, and some swinging light, real cool :)
i also added rigid body interactions with other entities like the bots and weapons.
for example: when we shot on a box, the box will be respond to the hit like a real box.
here is few videos that demonstrate the new features:

Weapons interaction


Skeleton of simple rope physics