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DarkBASIC Professional Discussion / A correct collision system?

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Qqite
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Posted: 6th Sep 2010 21:18
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I'm working on a program that I want to have a object jump, walk, and be able to walk to slopes to a certain extreme.

There was an amazing video I saw ages ago that went over everything to have an object move up slopes to a certain extreme, and if the slope is too steep, the object jsut slides down.

If anyone knows a video similar to this I will give you 100 cookies and a gallon of milk.

If no one knows a video then my question would be: What is the command/function needed to check collision only under the player, and to check if the slope of that collision is at what degree?

Ventures of the worlds around us are only limited by imagination.
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baxslash
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Posted: 6th Sep 2010 21:33
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Here is the best resource you'll find. I suggest Sparky's collision as it's accurate and fast:
http://forum.thegamecreators.com/?m=forum_view&t=95770&b=7

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Qqite
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Posted: 6th Sep 2010 23:21
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Btu is there anything in their that shows how to make collisions react to different slopes? Only thing I see is sliding collision but not much of angles :\

Ventures of the worlds around us are only limited by imagination.
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Indicium
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Posted: 6th Sep 2010 23:39
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One of the examples has a full sliding example :p

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Qqite
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Posted: 7th Sep 2010 00:23
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Yea I have sliding in my program, but I'm wanting to be able to have it check to see if the collision below an object of what angle it is. Otherwise saying if the slope is < 60* then allow control of character, else continue sliding down y.

Ventures of the worlds around us are only limited by imagination.
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dark coder
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Posted: 7th Sep 2010 05:53 Edited at: 7th Sep 2010 05:54
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You can retrieve the normal(direction unit vector) of the surface hit from all the raycast commands in Sparky's DLL, so yes.

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baxslash
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Posted: 8th Sep 2010 12:37
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After detecting a collision using sparky's Sphere Sliding collision detection just retrieve a normal in Y using:


If it's over a certain amount (0.7 is roughly 45 degrees) then you slide otherwise you don't.

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Indicium
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Posted: 8th Sep 2010 19:01
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Sorry to hijack, but how do the result that the normal command return relate to actual angles?

If i didn't make my question clear enough, how does 0.7 relate to 45 degrees?

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baxslash
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Posted: 8th Sep 2010 19:14
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If the normal was pointing straight up (like off a flat floor) it(sc_GetCollisionNormalY()) would return a value of 1.0. If it was a wall it would return 0.0.

At 45deg you have a hypotenuse of 1.0 so the normal in y would be about 0.7. It's just Pythagoras, if you imagine the hypot/normal is always 1.0... hope that makes sense I'm just going out the door...

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Indicium
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Posted: 8th Sep 2010 19:41
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ah right, I understand now, the sin of 0.7 is roughly 45 Thanks xD

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