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DarkBASIC Discussion / Collisions

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Parton
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Posted: 25th Mar 2009 12:07
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Hi have create a map with a jeep as the player. However i cannot get it to collide with any objects or stop it going off the map.
The collisions i used for my jeep to objects:

To stop the object going past the matrix:


Please can some one help me a.s.a.p. Thanks Dan.

Parton
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Quirkyjim
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Posted: 25th Mar 2009 21:50
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What are X# and Z#?

~QJ
That's what they WANT you to think...
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Link102
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Posted: 26th Mar 2009 00:50
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they are obviously the X an Z position of the object

if newxvalue > 0 and newxvalue < SIZ_TERRAIN and newzvalue > 0 and newzvalue < SIZ_TERRAIN
x# = newxvalue
z# = newzvalue
endif
what is newxvalue? I dont see any value added to this variable

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Quirkyjim
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Posted: 26th Mar 2009 21:52
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NEWXVALUE(Current X Value, Angle Value, Step Value) is a command that will get a new x position for an object.

Quoted form DB Help:
Quote: "
This command will return a value that represents the new X position of a point in 3D space. This command is used in conjunction with NEWYVALUE and NEWZVALUE commands to move from one point in space to another point in space based on a specified angle. Rather than using COS/SIN maths, these commands simplify the task of moving coordinates within 3D space. The step value specifies how far in the specified direction you would like to calculate. The parameters should be specified using real numbers."


~QJ
That's what they WANT you to think...
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Link102
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Posted: 27th Mar 2009 00:46 Edited at: 27th Mar 2009 00:49
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I know that, very handy for camera work.
However "x# = newxvalue" won't do anything


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Quirkyjim
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Posted: 27th Mar 2009 23:48
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Ah, I see what you're saying. I thought that you were talking about his use of the function, not the unused var.

~QJ
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Libervurto
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Posted: 28th Mar 2009 02:37
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good effort here
At the moment your collision detection routine is just placing your car where it is, what you need is to know what direction the car is going and push it back in the opposite direction a little or stop it from going in that direction.

To do this we need to store which buttons are being pressed (as its the user that decides where the car goes)...

this also makes it much easier to type
We first move the object as usual (but using the variables to get the new positions) and then we test for collisions, if we get a collision we invert the inputs to make the vehicle go the opposite direction (multiply them by -1), you'll need to have the movement code as a subroutine to do this so we can call it twice.

another way you could do it is to have two hidden objects at the front and back of the car and if they collide send them in the opp direction (like having bumpers).

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