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# d3d7 collision detection

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3 replies to this topic

### #1Anonymous Poster_Anonymous Poster_*  Guests

Posted 16 December 1999 - 08:11 PM

how do you do collision detection and physics and stuff?

### #2Facehat  Members

Posted 16 December 1999 - 01:16 PM

You need to be a bit more specific. For example, "how do I check for a collision between two triangles?" is a good question, but "how do I create a game?" is far too general.

--TheGoop

### #3Anonymous Poster_Anonymous Poster_*  Guests

Posted 16 December 1999 - 04:48 PM

how would i check for collision and do physics if an object is on top of a box and goes off the edge of the box. how would i make it just fall?

### #4Qoy  Members

Posted 16 December 1999 - 08:11 PM

Before you can just program that, you are going to have to know the physics formulas, and know how to do simple collision detection. The collision is simply a matter of checking if rectangle's overlap. The physics involves using the formulas for distance horizontally and vertically, and generating a vector or a point based on the calculations. I suggest you look up some physics stuff online. If I remember, the formula for the horizontal coord is distance = speed * time, so you would get the distance moved by multiplying the object's velocity times time. The vertical formula is distance = .5(9.8)time^2 for earth (9.8 is the gravitational constant for earth).

---------------------------
http://qoy.tripod.com

[This message has been edited by Qoy (edited December 17, 1999).]

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