Camera following object and rotate.

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1beginner1

15

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Joined: 28th Jun 2009

Location: Belgium

Posted: 30th Jun 2009 19:08 Edited at: 1st Jul 2009 12:00

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Hello I made a little maze you can control a object with your arrow keys through the maze. The camera is located a little behind the object. The first picture shows how I want my camera rotate. The second picture shows how it is now. How can I get it like in picture one?

#include "DarkGDK.h"

void (DarkGDK ())
{
	dbSyncOn( );
	dbSyncRate ( 60 );
	dbColorBackdrop(dbRgb(0,0,125));//color background
	dbDisableEscapeKey();
	dbAutoCamOff();

dbMakeObjectCube(1,5);//character
	dbLoadImage("crate1.jpg",1);//character texture
	dbLoadImage("crate.png",2);//wall Texture
	dbTextureObject(1,2);//texturing caharacter

for ( int i = 2; i < 26; i++ )//creating wall and texturing
	{
	dbMakeObjectCube( i, 25 );
	dbTextureObject(i,1);
	}
	
	dbPositionObject(2,-25,0,0);//positioning wall
	dbPositionObject(3,-25,0,25);
	dbPositionObject(4,0,0,50);
	dbPositionObject(5,25,0,50);
	dbPositionObject(6,25,0,0);
	dbPositionObject(7,50,0,50);
	dbPositionObject(8,75,0,25);
	dbPositionObject(9,75,0,0);
	dbPositionObject(10,0,0,-25);
	dbPositionObject(11,75,0,-25);
	dbPositionObject(12,50,0,-50);
	dbPositionObject(13,25,0,-75);
	dbPositionObject(14,0,0,-75);
	dbPositionObject(15,-25,0,-100);
	dbPositionObject(16,-50,0,-100);
	dbPositionObject(17,-75,0,-100);
	dbPositionObject(18,-100,0,-75);
	dbPositionObject(19,-100,0,-50);
	dbPositionObject(20,-50,0,-50);
	dbPositionObject(21,-75,0,-25);
	dbPositionObject(22,-75,0,0);
	dbPositionObject(23,-100,0,25);
	dbPositionObject(24,-75,0,50);
	dbPositionObject(25,-100,0,75);

bool exit = false;
	
	while ( LoopGDK ( ) )
	{
		//movement with arrow keys
		if (dbRightKey())
			dbMoveObjectRight(1,1);
		else if (dbLeftKey())
			dbMoveObjectLeft(1,1);
		else if (dbUpKey())
			dbMoveObject(1,1.0);
		else if (dbDownKey())
			dbMoveObject(1,-1.0);

//camera positioning
		int x = dbObjectPositionX(1);
		int z = dbObjectPositionZ(1);
		int y = dbObjectPositionY(1);
	dbPositionCamera(x,y,z-15);

//pressing esc ->show messagebox
if(dbEscapeKey())
		{
			int msgboxID = MessageBox(NULL,"Are you sure you want to quit the game?",
			"Quit Game", 4);
			switch (msgboxID)
			{
				case IDYES:
					 exit = true;
				case IDNO:
					 break;
			}
			}

if(dbObjectCollision(1,0))//character hit wall ->exit game
		exit = true;

if(exit == true)
		break;
		
	dbSync ( );
	}

return;
}

+ Code Snippet

#include "DarkGDK.h"

void (DarkGDK ())
{
	dbSyncOn( );
	dbSyncRate ( 60 );
	dbColorBackdrop(dbRgb(0,0,125));//color background
	dbDisableEscapeKey();
	dbAutoCamOff();

	dbMakeObjectCube(1,5);//character
	dbLoadImage("crate1.jpg",1);//character texture
	dbLoadImage("crate.png",2);//wall Texture
	dbTextureObject(1,2);//texturing caharacter

	for ( int i = 2; i < 26; i++ )//creating wall and texturing
	{
	dbMakeObjectCube( i, 25 );
	dbTextureObject(i,1);
	}
	
	dbPositionObject(2,-25,0,0);//positioning wall
	dbPositionObject(3,-25,0,25);
	dbPositionObject(4,0,0,50);
	dbPositionObject(5,25,0,50);
	dbPositionObject(6,25,0,0);
	dbPositionObject(7,50,0,50);
	dbPositionObject(8,75,0,25);
	dbPositionObject(9,75,0,0);
	dbPositionObject(10,0,0,-25);
	dbPositionObject(11,75,0,-25);
	dbPositionObject(12,50,0,-50);
	dbPositionObject(13,25,0,-75);
	dbPositionObject(14,0,0,-75);
	dbPositionObject(15,-25,0,-100);
	dbPositionObject(16,-50,0,-100);
	dbPositionObject(17,-75,0,-100);
	dbPositionObject(18,-100,0,-75);
	dbPositionObject(19,-100,0,-50);
	dbPositionObject(20,-50,0,-50);
	dbPositionObject(21,-75,0,-25);
	dbPositionObject(22,-75,0,0);
	dbPositionObject(23,-100,0,25);
	dbPositionObject(24,-75,0,50);
	dbPositionObject(25,-100,0,75);

	bool exit = false;
	
	while ( LoopGDK ( ) )
	{
		//movement with arrow keys
		if (dbRightKey())
			dbMoveObjectRight(1,1);
		else if (dbLeftKey())
			dbMoveObjectLeft(1,1);
		else if (dbUpKey())
			dbMoveObject(1,1.0);
		else if (dbDownKey())
			dbMoveObject(1,-1.0);

		//camera positioning
		int x = dbObjectPositionX(1);
		int z = dbObjectPositionZ(1);
		int y = dbObjectPositionY(1);
	dbPositionCamera(x,y,z-15);

	//pressing esc ->show messagebox
if(dbEscapeKey())
		{
			int msgboxID = MessageBox(NULL,"Are you sure you want to quit the game?",
			"Quit Game", 4);
			switch (msgboxID)
			{
				case IDYES:
					 exit = true;
				case IDNO:
					 break;
			}
			}

			

	if(dbObjectCollision(1,0))//character hit wall ->exit game
		exit = true;


	if(exit == true)
		break;
		
	dbSync ( );
	}


	return;
}

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Matty H

15

Years of Service

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Joined: 7th Oct 2008

Location: England

Posted: 30th Jun 2009 22:22 Edited at: 30th Jun 2009 22:27

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Try messing around with the following function:

+ Code Snippet

dbSetCameraToFollow(dbObjectPositionX(1), dbObjectPositionY(1), dbObjectPositionZ(1),dbObjectAngleY(1), 100, 50, 0.0f, 0);

You put this in your loop.

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Phosphoer

16

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Joined: 8th Dec 2007

Location: Seattle

Posted: 1st Jul 2009 01:02

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Alternatively, you can avoid the 'black box' of the db commands and use some simple trig. This will produce a more rigid camera than dbSetCameraToFollow will ( Though you could modify this to make it smooth ).

Some (kind of ) psuedo code, it should compile if the vars are declared:

+ Code Snippet

CameraPosX = PlayerPosX + cos( PlayerAngleInRadians ) * CameraDistanceFromPlayer;
CameraPosY = PlayerPosY + sin( PlayerAngleInRadians ) * CameraDistanceFromPlayer;
dbPositionCamera( CameraPosX, CameraPosY );
dbRotateCamera( PlayerAngleInDegrees );

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1beginner1

15

Years of Service

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Joined: 28th Jun 2009

Location: Belgium

Posted: 1st Jul 2009 12:10

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Thanks both of you
I used matty his code because I don't know how to declare my vars. But the movement is still not 100% ok. When I turn my object the camera turns to but when i do a spin of more then 180 degrés it starts to turn in he other way. When i do 360degrés it is back good. And i start always over.

This parts of my code I changed. In the first part I changed by left and right the dbMoveObjectLeft/Right in dbTurnObjectLeft/Right. So my angles becomes different. I deleted all my code about my camera and past the code you see in part 2. Both are in loop.

+ Code Snippet


if (dbRightKey())
dbTurnObjectRight(1,1);
else if (dbLeftKey())
dbTurnObjectLeft(1,1);
else if (dbUpKey())
dbMoveObject(1,1.0);
else if (dbDownKey())
dbMoveObject(1,-1.0);

+ Code Snippet

dbSetCameraToFollow(dbObjectPositionX(1), dbObjectPositionY(1), dbObjectPositionZ(1),dbObjectAngleY(1),15,0, 1.0,0);

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Matty H

15

Years of Service

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Joined: 7th Oct 2008

Location: England

Posted: 1st Jul 2009 18:14

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Try this:

+ Code Snippet

if (dbRightKey())
dbRotateObject(1, 0, dbObjectAngleY(1) + 1, 0);
if (dbLeftKey())
dbRotateObject(1, 0, dbObjectAngleY(1) - 1, 0);

I used this in my loop:

+ Code Snippet

char* angleY = dbStr(dbObjectAngleY(1));
dbText(0, 15, "Y angle: ");
dbText(80, 15, angleY);

And discovered that dbTurnObjectRight and dbTurnObjectLeft do some strange things with the Y angle, those commands must be used for something different.

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1beginner1

15

Years of Service

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Joined: 28th Jun 2009

Location: Belgium

Posted: 2nd Jul 2009 12:05

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Thanks Matty

It's working great now. Exactly like I wanted it to work.

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Dark GDK / Camera following object and rotate.