Object Collision Help - GameCreators Forum

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Timatron

14

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Joined: 5th Dec 2009

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Posted: 14th Dec 2009 01:45

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I was working on the collisions in my game, and I can't get it to work. I know whats happening but I don't know how to fix it. I have it so when the player collides with the cactus in the game, all movement is disabled, but then he cant move at all. If I put dbMoveObject(ID,-3); it works when the player is facing forward but when they're facing backwards it sends them through the cactus.

Here's my collision code

+ Code Snippet

	if (dbObjectCollision(74,103) == 0)
	{
		if (dbUpKey())
		{
			dbMoveCamera(2 + run);
			// make gun move
			dbSetObjectSpeed ( 3, 65 + runimage);
		}
		if (dbDownKey())
		{
			dbMoveCamera(-1);
		}
		if (dbLeftKey())
		{
			dbYRotateCamera ( 0 , dbCameraAngleY( 0 ) - 90 );
			dbMoveCamera(2);
		}
		if (dbRightKey())
		{
			dbYRotateCamera ( 0 , dbCameraAngleY( 0 ) + 90 );
			dbMoveCamera(2);
		}
	}

The "if (dbObjectCollision(74,103) == 0)" is when the player collides with the cactus. Thanks everybody! Any help is greatly appreciated.

-Tim

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logicandchaos

15

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Joined: 22nd Sep 2009

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Posted: 14th Dec 2009 16:58

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hey i think your problem is that your obects are still touching, you have to move your player object when there is a collision

if(dbObjectCollision(74,103)==0){
//move player back from object
}
but then you have to know what direction you were going which you could use a varible to keep track of, or you could try:

//if (dbObjectCollision(74,103) == 0)
	//{
		if (dbUpKey())
		{
			if (dbObjectCollision(74,103) == 0)
                           //move player back
                        else{
                           dbMoveCamera(2 + run);
			   // make gun move
			   dbSetObjectSpeed ( 3, 65 + runimage);
                        }
		}
		if (dbDownKey())
		{
		   if (dbObjectCollision(74,103) == 0)
                       //move player back
                   else
                      dbMoveCamera(-1);
		}
		if (dbLeftKey())
		{
                    if (dbObjectCollision(74,103) == 0)
                           //move player back
                        else{
			dbYRotateCamera ( 0 , dbCameraAngleY( 0 ) - 90 );
			dbMoveCamera(2);
                        }
		}
		if (dbRightKey())
		{
                    if (dbObjectCollision(74,103) == 0)
                           //move player back
                        else{
			dbYRotateCamera ( 0 , dbCameraAngleY( 0 ) + 90 );
			dbMoveCamera(2);
                        }
		}
	//}

+ Code Snippet

//if (dbObjectCollision(74,103) == 0)
	//{
		if (dbUpKey())
		{
			if (dbObjectCollision(74,103) == 0)
                           //move player back
                        else{
                           dbMoveCamera(2 + run);
			   // make gun move
			   dbSetObjectSpeed ( 3, 65 + runimage);
                        }
		}
		if (dbDownKey())
		{
		   if (dbObjectCollision(74,103) == 0)
                       //move player back
                   else
                      dbMoveCamera(-1);
		}
		if (dbLeftKey())
		{
                    if (dbObjectCollision(74,103) == 0)
                           //move player back
                        else{
			dbYRotateCamera ( 0 , dbCameraAngleY( 0 ) - 90 );
			dbMoveCamera(2);
                        }
		}
		if (dbRightKey())
		{
                    if (dbObjectCollision(74,103) == 0)
                           //move player back
                        else{
			dbYRotateCamera ( 0 , dbCameraAngleY( 0 ) + 90 );
			dbMoveCamera(2);
                        }
		}
	//}

logicandchaos

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Hassan

15

Years of Service

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Joined: 4th May 2009

Location: <script> alert(1); </script>

Posted: 14th Dec 2009 18:33 Edited at: 14th Dec 2009 18:34

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try this:

+ Code Snippet

float oldx = objectx
oldy = object y
oldz = object z

//move, with collision or without..

if ( dbObjectCollsiion ( ID, ID ) )
dbPositionObject ( oldx, oldy, olz );

So, you move freely, and everytime you move you save the old location, and at the end you check if they're colliding, if so, go back to old position.

hope that helped

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Timatron

14

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Joined: 5th Dec 2009

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Posted: 14th Dec 2009 21:43

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Thanks for the help guys, I used what both of you said and got it to work. I had to make an X, Y, and Z variable for when the two weren't colliding and then set the object back to them. Thanks!!!

-Tim

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