[help] Collision with Sparky, Need guidance.

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vocebello

19

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Joined: 30th Dec 2004

Location: Toronto, Canada

Posted: 12th Mar 2009 05:08 Edited at: 12th Mar 2009 07:34

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I have been able to detect collision between an object (character) and another object (world).

However, I have not been able to stop the character from walking through the walls. I've been looking through the forums for the past few hours, and still seem stumped. I have included my code so you may see how I'm detecting collision, in hopes that you may be able to assist me in determining what steps I should take.

#include "DarkGDK.h"
#include "SC_Collision.h"

void DarkGDK ( void )
{
	dbSyncOn   ( );
	dbSyncRate ( 60 );
	dbSetWindowOff ( );
	dbHideMouse ( );
	dbSetDisplayMode (1024, 768, 32);
	dbLoadMusic("sounds/shot.mp3", 1);
	dbLoadMusic("sounds/reload.mp3", 2);
	dbColorBackdrop( dbRGB(0,0,0) );
	dbAutoCamOff();

dbLoadObject ("maps/box.dbo", 1);
	dbSetObjectLight	( 1, 0 );
	SC_Start();
	SC_SetupObject ( 1, 0, 0);

dbPositionCamera ( -250, 100, -5);

dbMakeObjectBox (2,20,100,20);
	dbPositionObject (2, -250, 82, 30);
	SC_SetupObject (2, 0, 0);

dbMakeObjectBox (3,20,100,20);
	dbPositionObject (3, -250, 82, -5);
	dbHideObject(3);
	SC_SetupObject (3, 0, 0);

float fCameraAngleX = 0.0f;
	float fCameraAngleY = 0.0f;
	int ammo;
	int collide = 0;

ammo = 20;

while ( LoopGDK ( ) )
	{
		dbControlCameraUsingArrowKeys ( 0, 5.0f, 0.3f );

fCameraAngleX = dbWrapValue ( fCameraAngleX + dbMouseMoveY ( ) * 0.4f );
		fCameraAngleY = dbWrapValue ( fCameraAngleY + dbMouseMoveX ( ) * 0.4f );

dbPositionCamera ( dbCameraPositionX ( ), 100.0f, dbCameraPositionZ ( ) );
		dbPositionObject ( 3, dbCameraPositionX ( ), 100.0f, dbCameraPositionZ ( ) );

SC_UpdateObject(3);
		collide = SC_ObjectCollision (1, 3);

if (collide > 0)
		{
			dbText ( dbScreenWidth()/2, dbScreenHeight()/2, "COLLISION!!!");
		}

dbXRotateCamera ( fCameraAngleX );
		dbYRotateCamera ( fCameraAngleY );

dbSetTextFont("Arial");
		dbSetTextSize(20);
		dbText(dbScreenWidth()/2,dbScreenHeight()/2,"+");
		dbText(0,0,dbStr(ammo));

int mouseClick = dbMouseClick();
		int mousePressed;

if (mouseClick == 1) {
			mousePressed = mousePressed + 1;
			if (mousePressed == 1){
				if (ammo > 0){
					ammo = ammo - 1;
					dbPlayMusic(1);
				} else {
					dbText(0,0,"Reload ammo");
				}
			}
		}
		if (mouseClick == 2) {
			ammo = 20;
			dbPlayMusic(2);
			dbText(0,0,"Reload");
		}
		if (mouseClick == 0) {
			mousePressed = 0;
			int musicShotPlaying = dbMusicPlaying(1);
			if (musicShotPlaying == 0){
				dbStopMusic(1);
			}
			int musicReloadPlaying = dbMusicPlaying(2);
			if (musicReloadPlaying == 0){
				dbStopMusic(2);
			}
		}
		
		dbText(dbScreenWidth()/2, 0, dbStr(dbCameraPositionX ( )));
		dbText(dbScreenWidth()/2, 20, dbStr(dbCameraPositionY ( )));
		dbText(dbScreenWidth()/2, 40, dbStr(dbCameraPositionZ ( )));

dbSync ( );
	}

return;
}

+ Code Snippet

#include "DarkGDK.h"
#include "SC_Collision.h"

void DarkGDK ( void )
{
	dbSyncOn   ( );
	dbSyncRate ( 60 );
	dbSetWindowOff ( );
	dbHideMouse ( );
	dbSetDisplayMode (1024, 768, 32);
	dbLoadMusic("sounds/shot.mp3", 1);
	dbLoadMusic("sounds/reload.mp3", 2);
	dbColorBackdrop( dbRGB(0,0,0) );
	dbAutoCamOff();

	dbLoadObject ("maps/box.dbo", 1);
	dbSetObjectLight	( 1, 0 );
	SC_Start();
	SC_SetupObject ( 1, 0, 0);

	dbPositionCamera ( -250, 100, -5);

	dbMakeObjectBox (2,20,100,20);
	dbPositionObject (2, -250, 82, 30);
	SC_SetupObject (2, 0, 0);

	dbMakeObjectBox (3,20,100,20);
	dbPositionObject (3, -250, 82, -5);
	dbHideObject(3);
	SC_SetupObject (3, 0, 0);

	float fCameraAngleX = 0.0f;
	float fCameraAngleY = 0.0f;
	int ammo;
	int collide = 0;

	ammo = 20;

	while ( LoopGDK ( ) )
	{
		dbControlCameraUsingArrowKeys ( 0, 5.0f, 0.3f );

		fCameraAngleX = dbWrapValue ( fCameraAngleX + dbMouseMoveY ( ) * 0.4f );
		fCameraAngleY = dbWrapValue ( fCameraAngleY + dbMouseMoveX ( ) * 0.4f );

		dbPositionCamera ( dbCameraPositionX ( ), 100.0f, dbCameraPositionZ ( ) );
		dbPositionObject ( 3, dbCameraPositionX ( ), 100.0f, dbCameraPositionZ ( ) );

		SC_UpdateObject(3);
		collide = SC_ObjectCollision (1, 3);

		if (collide > 0)
		{
			dbText ( dbScreenWidth()/2, dbScreenHeight()/2, "COLLISION!!!");
		}

		dbXRotateCamera ( fCameraAngleX );
		dbYRotateCamera ( fCameraAngleY );

		dbSetTextFont("Arial");
		dbSetTextSize(20);
		dbText(dbScreenWidth()/2,dbScreenHeight()/2,"+");
		dbText(0,0,dbStr(ammo));

		int mouseClick = dbMouseClick();
		int mousePressed;

		if (mouseClick == 1) {
			mousePressed = mousePressed + 1;
			if (mousePressed == 1){
				if (ammo > 0){
					ammo = ammo - 1;
					dbPlayMusic(1);
				} else {
					dbText(0,0,"Reload ammo");
				}
			}
		}
		if (mouseClick == 2) {
			ammo = 20;
			dbPlayMusic(2);
			dbText(0,0,"Reload");
		}
		if (mouseClick == 0) {
			mousePressed = 0;
			int musicShotPlaying = dbMusicPlaying(1);
			if (musicShotPlaying == 0){
				dbStopMusic(1);
			}
			int musicReloadPlaying = dbMusicPlaying(2);
			if (musicReloadPlaying == 0){
				dbStopMusic(2);
			}
		}
		
		dbText(dbScreenWidth()/2, 0, dbStr(dbCameraPositionX ( )));
		dbText(dbScreenWidth()/2, 20, dbStr(dbCameraPositionY ( )));
		dbText(dbScreenWidth()/2, 40, dbStr(dbCameraPositionZ ( )));

		dbSync ( );
	}

	return;
}

Thank you in advance.

Andre Mourinho

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J_C

17

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Joined: 9th Nov 2007

Location:

Posted: 12th Mar 2009 21:25

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You need to set-up some float varables before you enter the loop to keep the position of your camera object oldX & oldZ

you then set these to the camera object position in your loop.
Now when you move and detect collision you must re-positon your
camera and object back to oldX & oldZ position.

This is what stops you going through the objects you hit.

but you should really look through the samples that came
with Sparkys collison.

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vocebello

19

Years of Service

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Joined: 30th Dec 2004

Location: Toronto, Canada

Posted: 12th Mar 2009 23:09 Edited at: 12th Mar 2009 23:17

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I've changed my code a bit,

+ Code Snippet

		xold	= dbCameraPositionX();
		zold	= dbCameraPositionZ();

		// move the camera using the arrow keys
		dbControlCameraUsingArrowKeys ( 0, 5.0f, 0.3f );

		// create a rotation axis based on mouse movement
		fCameraAngleX = dbWrapValue ( fCameraAngleX + dbMouseMoveY ( ) * 0.4f );
		fCameraAngleY = dbWrapValue ( fCameraAngleY + dbMouseMoveX ( ) * 0.4f );

		SC_UpdateObject(3);
		collide = SC_ObjectCollision (1, 3);

		ax = dbCameraPositionX();
		az = dbCameraPositionZ();

		if (collide > 0){
			dbText ((dbScreenWidth()/2)-45, (dbScreenHeight()/2) -25, "COLLISION!");
			//ax = SC_GetCollisionNormalX(3);
			//az = SC_GetCollisionNormalZ(3);
			dbPositionCamera ( xold-1, 100.0f, zold-1);
			dbPositionObject ( 3, xold-1, 100.0f, zold-1);
			collide = 0;
			SC_UpdateObject(3);
		} else {

			dbPositionCamera ( ax, 100.0f, az);
			dbPositionObject ( 3, ax, 100.0f, az);

		}

However, I can't seem to use sparky's collision stuff. It doesn't stop me from going through walls. My code I altered with a sloppy fix. I bounce off the walls a small amount, and go through them if the x or z value is positive. Close, but not there.
I've tried sparky's tutorials and combing the forums. I'll continue to do that, but I feel like I'm not too far off, and its something I'm just not seeing. I took your advice on the oldX and oldZ position as you can see in my code.

Thanks J_C for your help! =)

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vocebello

19

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Joined: 30th Dec 2004

Location: Toronto, Canada

Posted: 13th Mar 2009 00:02

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With a little bit of your help, and determination, I was able to get it working. THANK YOU J_C for the little tip that head me in the right direction.

I've included my code in case anyone has the same problem I did!

#include "DarkGDK.h"
#include "SC_Collision.h"

// the main entry point for the application is this function
void DarkGDK ( void )
{
	// turn on sync rate and set maximum rate to 60 fps
	dbSyncOn   ( );
	dbSyncRate ( 60 );
	dbSetWindowOff ( );
	dbHideMouse ( );
	dbSetDisplayMode (1024, 768, 32);
	dbLoadMusic("sounds/shot.mp3", 1);
	dbLoadMusic("sounds/reload.mp3", 2);
	dbColorBackdrop( dbRGB(0,0,0) );
	dbAutoCamOff();

dbLoadObject ("maps/box.dbo", 1);
	dbSetObjectLight	( 1, 0 );
	SC_Start();
	SC_SetupObject ( 1, 0, 0);

dbPositionCamera ( -250, 100, -5);

// DUMMY PLAYER
	dbMakeObjectBox (2,40,100,40);
	dbPositionObject (2, -250, 82, 30);
	SC_SetupObject (2, 0, 0);

// YOUR CHARACTER
	dbMakeObjectBox (3,40,100,40);
	dbPositionObject (3, -250, 82, -5);
	dbHideObject(3);
	SC_SetupObject (3, 0, 0);

float fCameraAngleX = 0.0f;
	float fCameraAngleY = 0.0f;
	int ammo;
	int collide = 0;
	float ax;
	float az;
	float oldx;
	float oldz;

ammo = 20;

// our main loop
	while ( LoopGDK ( ) )
	{
		oldx = dbCameraPositionX();
		oldz = dbCameraPositionZ();

// move the camera using the arrow keys
		dbControlCameraUsingArrowKeys ( 0, 5.0f, 0.3f );

// create a rotation axis based on mouse movement
		fCameraAngleX = dbWrapValue ( fCameraAngleX + dbMouseMoveY ( ) * 0.4f );
		fCameraAngleY = dbWrapValue ( fCameraAngleY + dbMouseMoveX ( ) * 0.4f );

SC_UpdateObject(3);
		
		ax = dbCameraPositionX();
		az = dbCameraPositionZ();

collide = SC_SphereSlide( 0, oldx,100.0f,oldz, ax,100.0f,az, 20.0f, 3 );

if (collide > 0){
			dbText ((dbScreenWidth()/2)-45, (dbScreenHeight()/2) -25, "COLLISION!");
			dbPositionObject(3, SC_GetCollisionSlideX(),SC_GetCollisionSlideY(),SC_GetCollisionSlideZ() );
			dbPositionCamera(SC_GetCollisionSlideX(),SC_GetCollisionSlideY(),SC_GetCollisionSlideZ());
		} else {
			dbPositionCamera ( ax, 100.0f, az);
			dbPositionObject ( 3, ax, 100.0f, az);
		}

dbText(200,200,dbStr(ax));
		dbText(200,225,dbStr(az));

// rotate camera
		dbXRotateCamera ( fCameraAngleX );
		dbYRotateCamera ( fCameraAngleY );

dbSetTextFont("Arial");
		dbSetTextSize(20);
		dbText(dbScreenWidth()/2,dbScreenHeight()/2,"+");
		dbText(0,0,dbStr(ammo));
		if (ammo == 0){
			dbText((dbScreenWidth()/2)-50,(dbScreenHeight()/2) - 50,"Reload Ammo!");
		}

// bullet code
		int mouseClick = dbMouseClick();
		int mousePressed;

if (mouseClick == 1) {
			mousePressed = mousePressed + 1;
			if (mousePressed == 1){
				if (ammo > 0){
					ammo = ammo - 1;
					dbPlayMusic(1);
				}
			}
		}
		if (mouseClick == 2) {
			ammo = 20;
			dbPlayMusic(2);
		}
		if (mouseClick == 0) {
			mousePressed = 0;
			int musicShotPlaying = dbMusicPlaying(1);
			if (musicShotPlaying == 0){
				dbStopMusic(1);
			}
			int musicReloadPlaying = dbMusicPlaying(2);
			if (musicReloadPlaying == 0){
				dbStopMusic(2);
			}
		}
		// display location
		dbText(dbScreenWidth()/2, 0, dbStr(dbCameraPositionX ( )));
		dbText(dbScreenWidth()/2, 20, dbStr(dbCameraPositionY ( )));
		dbText(dbScreenWidth()/2, 40, dbStr(dbCameraPositionZ ( )));

// update screen
		dbSync ( );
	}

// return back to windows
	return;
}

+ Code Snippet

#include "DarkGDK.h"
#include "SC_Collision.h"

// the main entry point for the application is this function
void DarkGDK ( void )
{
	// turn on sync rate and set maximum rate to 60 fps
	dbSyncOn   ( );
	dbSyncRate ( 60 );
	dbSetWindowOff ( );
	dbHideMouse ( );
	dbSetDisplayMode (1024, 768, 32);
	dbLoadMusic("sounds/shot.mp3", 1);
	dbLoadMusic("sounds/reload.mp3", 2);
	dbColorBackdrop( dbRGB(0,0,0) );
	dbAutoCamOff();

	dbLoadObject ("maps/box.dbo", 1);
	dbSetObjectLight	( 1, 0 );
	SC_Start();
	SC_SetupObject ( 1, 0, 0);

	dbPositionCamera ( -250, 100, -5);

	// DUMMY PLAYER
	dbMakeObjectBox (2,40,100,40);
	dbPositionObject (2, -250, 82, 30);
	SC_SetupObject (2, 0, 0);

	// YOUR CHARACTER
	dbMakeObjectBox (3,40,100,40);
	dbPositionObject (3, -250, 82, -5);
	dbHideObject(3);
	SC_SetupObject (3, 0, 0);

	float fCameraAngleX = 0.0f;
	float fCameraAngleY = 0.0f;
	int ammo;
	int collide = 0;
	float ax;
	float az;
	float oldx;
	float oldz;

	ammo = 20;

	// our main loop
	while ( LoopGDK ( ) )
	{
		oldx = dbCameraPositionX();
		oldz = dbCameraPositionZ();

		// move the camera using the arrow keys
		dbControlCameraUsingArrowKeys ( 0, 5.0f, 0.3f );

		// create a rotation axis based on mouse movement
		fCameraAngleX = dbWrapValue ( fCameraAngleX + dbMouseMoveY ( ) * 0.4f );
		fCameraAngleY = dbWrapValue ( fCameraAngleY + dbMouseMoveX ( ) * 0.4f );

		SC_UpdateObject(3);
		
		ax = dbCameraPositionX();
		az = dbCameraPositionZ();

		collide = SC_SphereSlide( 0, oldx,100.0f,oldz, ax,100.0f,az, 20.0f, 3 );

		if (collide > 0){
			dbText ((dbScreenWidth()/2)-45, (dbScreenHeight()/2) -25, "COLLISION!");
			dbPositionObject(3, SC_GetCollisionSlideX(),SC_GetCollisionSlideY(),SC_GetCollisionSlideZ() );
			dbPositionCamera(SC_GetCollisionSlideX(),SC_GetCollisionSlideY(),SC_GetCollisionSlideZ());
		} else {
			dbPositionCamera ( ax, 100.0f, az);
			dbPositionObject ( 3, ax, 100.0f, az);
		}

		dbText(200,200,dbStr(ax));
		dbText(200,225,dbStr(az));

		// rotate camera
		dbXRotateCamera ( fCameraAngleX );
		dbYRotateCamera ( fCameraAngleY );

		dbSetTextFont("Arial");
		dbSetTextSize(20);
		dbText(dbScreenWidth()/2,dbScreenHeight()/2,"+");
		dbText(0,0,dbStr(ammo));
		if (ammo == 0){
			dbText((dbScreenWidth()/2)-50,(dbScreenHeight()/2) - 50,"Reload Ammo!");
		}

		// bullet code
		int mouseClick = dbMouseClick();
		int mousePressed;

		if (mouseClick == 1) {
			mousePressed = mousePressed + 1;
			if (mousePressed == 1){
				if (ammo > 0){
					ammo = ammo - 1;
					dbPlayMusic(1);
				}
			}
		}
		if (mouseClick == 2) {
			ammo = 20;
			dbPlayMusic(2);
		}
		if (mouseClick == 0) {
			mousePressed = 0;
			int musicShotPlaying = dbMusicPlaying(1);
			if (musicShotPlaying == 0){
				dbStopMusic(1);
			}
			int musicReloadPlaying = dbMusicPlaying(2);
			if (musicReloadPlaying == 0){
				dbStopMusic(2);
			}
		}
		// display location
		dbText(dbScreenWidth()/2, 0, dbStr(dbCameraPositionX ( )));
		dbText(dbScreenWidth()/2, 20, dbStr(dbCameraPositionY ( )));
		dbText(dbScreenWidth()/2, 40, dbStr(dbCameraPositionZ ( )));

		// update screen
		dbSync ( );
	}

	// return back to windows
	return;
}

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J_C

17

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Joined: 9th Nov 2007

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Posted: 13th Mar 2009 19:59

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Congratulations! vocebello
you did it all yourself
your determination will take you far.

I am pleased you made the leap to Collision Slide commands.
By taking small steps we can all learn...
Enjoy your programing journey...

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Dark GDK / [help] Collision with Sparky, Need guidance.