Gravity in Dark GDK with Sparky's Collision

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Alexw

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Joined: 22nd Feb 2011

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Posted: 28th Feb 2011 12:53

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Hey,

I got the follow code in my movement script:

+ Code Snippet

			int collide = SC_RayCast( 0, oldx, oldy, oldz, position.x, position.y, position.z, 0 );

			if ( collide ){
				int collidefloor = SC_RayCast( 0, oldx, oldy + 2, oldz, position.x, position.y + 2, position.z, 0 );
				if ( !collidefloor ){
					position.y += 2;
				}
				

				if( collidefloor  ){
					position.x = oldx;
					position.y = oldy;
					position.z = oldz;
				}
			}

Now the first collidefloor is for checking if he can go up on stairs.
That is working very good. But now i want to add script that i can go downwards, and a script to put gravity in, you if he jumps off a wall then he just go down, for now he just hangs in the air.

I hope someone can help me with this.

Thanks,
Alexw

Alexw

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Alexw

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Joined: 22nd Feb 2011

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Posted: 28th Feb 2011 19:35

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UPDATE:

I got the follow code now:

+ Code Snippet

			int collide = SC_RayCast( 0, oldx, oldy, oldz, position.x, position.y, position.z, 0 );

			if ( collide ){
				int collidefloor = SC_RayCast( 0, oldx, oldy + 2, oldz, position.x, position.y + 2, position.z, 0 );
				if ( !collidefloor ){
					position.y += 2;
				} else {
					position.x = oldx;
					position.y = oldy;
					position.z = oldz;
				}
			} else {
				int collidefloor = SC_RayCast( 0, oldx, oldy - 1, oldz, position.x, position.y - 1, position.z, 0 );

				if( !collidefloor ){
					position.y -= 1;
				}
			}

But the problem now that he go trough the floor instead of stopping...

Any solutions?

Alexw

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WLGfx

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Location: NW United Kingdom

Posted: 1st Mar 2011 01:51

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I actually found it much easier using the SphereCast collision for holding onto ground/terrain. I've added a project into the codebase forum with a fully working sliding collision, gravity, jump code within it.

Without seeing the code working I can't see much with your code. I would rather use raycast for such things as avoidance ai, laser guns, simple stuff like that.

Warning! May contain Nuts!

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Alexw

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Posted: 1st Mar 2011 12:18

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If i use SphereCast i get stuck, cant move.
See my coding in the attachement...

Please note that i will remove this attachment when my problem is fixed.

Alexw

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Mireben

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Posted: 2nd Mar 2011 20:57 Edited at: 2nd Mar 2011 21:00

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When you use sphere cast, exclude the object itself from the cast, otherwise it will collide with itself and won't move.

I noticed that you use a matrix for the floor. I'm not sure you can use a matrix in collision checks. Try with a solid object, a plane or an X model.

If it must be a matrix, you can get the height at a given point with dbGetGroundHeight and compare that to your character's Y coordinate to stop it from falling through the matrix.

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Alexw

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Posted: 3rd Mar 2011 12:03

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I tryd the followed:

+ Code Snippet

int collidefloor = SC_SphereCast( 0, oldx, oldy - 1, oldz, position.x, position.y - 1, position.z, 10, PLAYER );

But i still get stuck, and its still moving trough the floor...

Alexw

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Alexw

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Posted: 3rd Mar 2011 23:10

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Edit: Im not using that floor. I did not delete it yet, im still testing things out.
The floor is just the floor that is represented in the city model...

Alexw

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Dark GDK / Gravity in Dark GDK with Sparky's Collision

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