Animation frames blending, player input/physics

Below is the code which handles camera collision in the zelda code, it has been a long time since I looked at this and even now I'm not sure why some instructions and calculations are being used. I went through and commented what I thought was going on in certain places, it may not make sense, somethings confuse me alot.

Hope it helps.

David

//where camera.pan is being used in trigonometry calculations, the value used to be cam_xyangle in the zelda code, I'm not exactly sure if changing it to camera.pan will work or not

//

FUNCTION pan_back() 
{
	//cam height is the height the camera is relative to the player's z coordinte
        cam_height -= mouse_force.y * 40 * time; 
        cam_height = clamp(cam_height, -150, 300);

	//dist_total is the radius the camera is from the player
	vec_set(temp.x, vector(player.x - fcos(camera.pan, dist_total - 10), player.y - fsin(camera.pan, dist_total - 10), player.z + cam_height));  //find the camera position 10 quants behind the camera (not sure why I'm tracing 10 quants behind the camera, would be better to use vec_add rather than just the x and y component)		

	vec_diff(temp2.x,player.x,temp.x); //from behind the camera to the player
	vec_normalize(temp2.x,16); //set vector to magnitude of 16
	vec_add(temp.x,temp2.x); //set temp.x 16 quants longer, so we are tracing 16 quants behind the camera

	trace_mode = ignore_me + ignore_passable;
	trace (player.x,temp.x); //trace from the player to the camera position, this trace is used to calculate planar_to and camera_move_to.z

	dist_traced = sqrt((target.x - player.x)*(target.x - player.x)+(target.y - player.y)*(target.y - player.y));

	IF (dist_traced > 0) //if the trace hit a wall
        { 
		vec_set(temp.x,target.x);
		vec_diff(temp2.x,player.x,target.x); //vector from trace hit point to the player
		vec_normalize(temp2.x,16); //normalize vector
		vec_add(temp.x,temp2.x); //move temp.x 16 quants behind target.x
		result = sqrt((temp.x - my.x)*(temp.x - my.x) + (temp.y - my.y)*(temp.y - my.y));
		IF (result < dist_total) 
                { 
                   planar_to = result; //planar_to is the radius at which the camera moves to, if the calculated distance from the camera to the player is less than the maximum distance the camera could possibly be, not exactly sure why this if statement is being used
                } 
	} 
        ELSE 
        {
           planar_to = dist_total;
	}

	   camera_move_to.z = target.z; //camera_move_to vector is the coordinates at which the camera smoothly moves to, z component is calculate instantly whilst x and y are calculated differently
           player.z -= 15; //temporarily changed so that camera focusus slightly above middle
           
           var temp2[3];

	   vec_set(temp2,camera.x);
           vec_set(temp,my.x);
           vec_sub(temp,temp2.x);
           vec_to_angle(temp.pan,temp);
           camera.tilt = temp.tilt + 7;  //this causes the camera to tily towards the player

	//this smoothly moves dist_planar to the planar_to variable (the radius the camera is from the player)

	IF (abs(dist_planar - planar_to) > 2) 
        {
           cradius_speed = (dist_planar - planar_to) / -1;

	} 
        ELSE 
        {
           cradius_speed = 0;
           my.skill15 = 0;
	}
	
        MY.skill15 += (TIME * cradius_speed)  - (min(TIME*0.7,1) * my.skill15);
	dist_planar += MY.skill15  * TIME;
	dist_planar = planar_to;

	//tracing from camera to below the camera to see if the camera is on the ground

	trace_mode = ignore_me + ignore_passable;
	result = trace (vector(camera.x,camera.y,player.z + 15),vector(camera.x,camera.y,camera.z + 5));

	IF (result > 0) && (cam_height > result - 5) 
        { 
           cam_height = result - 5; 
        }  //if we have traced something place the camera above it

	camera_move_to.x = player.x - dist_planar * cos(camera.pan); //set the value at which the camera needs to smoothly move to
	camera_move_to.y = player.y - dist_planar * sin(camera.pan);

	//this is similar code to the template camera, the camera needs to be at the camera_move_to coordinates, this traces at a position, which smoothly moves towards the camera_move_to, and places the camera at the target.x vector, this works well because instead of placing the camera ta camera_move_to, it traces at a position which smoothly moves to camera_move_to

	// move towards target position

	//camera_smooth_to vector smoothly but quicly moves towards the camera_move_to.x variable (the position the camera should be)

	temp2 = min(1,0.5 * time);    // value of 1 places us at target, this value is what allows the smooth movement
	camera_smooth_to.x += temp2*(camera_move_to.x - camera_smooth_to.x); //the bigger the gap between camera_move_to.x - camera_smooth_to.x, the faster the camera moves
	camera_smooth_to.y += temp2*(camera_move_to.y - camera_smooth_to.y);
	camera_smooth_to.z += temp2*(camera_move_to.z - camera_smooth_to.z);

	// keep camera from penetrating walls

	vec_diff(temp2.x,camera_smooth_to.x,player.x); //find vector from player to the positoin the camera should be
	vec_normalize(temp2.x,16); //move vector 16 quants behind camera
	vec_add(temp2.x,camera_smooth_to.x);	// temp2 = temp_cdist + 16 units away from view target

	me = player;

	trace_mode = ignore_me + ignore_passable + ignore_models + ignore_sprites;
	IF (trace(player.x,temp2.x) > 0)  
        { //trace from the player to the position 16 quants behind the camera
    	  //if the trace hit a wall
           vec_diff(temp2.x,player.x,target.x); //from player to the target position
           vec_normalize(temp2.x,16);
           vec_set(camera.x,target.x); //set camera at the traced position
           vec_add(camera.x,temp2.x);
 	} 
        ELSE 
        {
           //if the trace has not hit something set the camera to camera_smooth_to;
           vec_set(camera.x,camera_smooth_to.x);
	}
}

Hey OB

Sorry for the late reply.

I hope this works, this is very simple camera movement which should work with any entity, just have the player call handle_camera(); from it's main loop. And it should work. Although simple camera collision may be more effective, so I've added something like that further below.

Let me know how it goes.

David

var camera_move_to[3];
var camera_smooth_to[3];
var camera_distance = 200;
var camera_pan;
var camera_tilt;

FUNCTION handle_camera() 
{

	camera_pan -= mouse_force.x * 12 * time_step;
	camera_tilt += mouse_force.y * 8 * time_step;
	camera_tilt = clamp(camera_tilt,-30,10);
	camera.pan = camera_pan;
	temp = fcos(camera_tilt,-camera_distance);
	vec_set(camera_move_to.x,vector(my.x + fcos(camera.pan,temp),my.y + fsin(camera.pan,temp),my.z + 20 + fsin(camera_tilt,-camera_distance)));

	//this is similar code to the template camera, the camera needs to be at the camera_move_to coordinates, this traces at a position, which smoothly moves towards the camera_move_to, and places the camera at the target.x vector, this works well because instead of placing the camera ta camera_move_to, it traces at a position which smoothly moves to camera_move_to

	// move towards target position
	temp = min(1,0.5 * time);    // value of 1 places us at target, this value is what allows the smooth movement
	camera_smooth_to.x += temp*(camera_move_to.x - camera_smooth_to.x);
	camera_smooth_to.y += temp*(camera_move_to.y - camera_smooth_to.y);
	camera_smooth_to.z += temp*(camera_move_to.z - camera_smooth_to.z);

	// keep camera from penetrating walls
	vec_diff(temp.x,camera_smooth_to.x,my.x);
	vec_normalize(temp.x,16);
	vec_add(temp.x,camera_smooth_to.x);	// temp2 = temp_cdist + 16 units away from view target

	trace_mode = ignore_me + ignore_passable + ignore_models + ignore_sprites;
	IF (trace(my.x,temp.x) > 0) 
        {

		vec_diff(temp.x,my.x,target.x);
		vec_normalize(temp.x,16);
		vec_set(camera.x,target.x);
		vec_add(camera.x,temp.x);

	} 
        ELSE 
        {
		vec_set(camera.x,camera_smooth_to.x);
	}

	vec_diff(temp.x,my.x,camera.x);
	vec_to_angle(temp.pan,temp.x);
	camera.pan = temp.pan;
	camera.tilt = temp.tilt;
}


FUNCTION handle_camera() 
{
	camera.pan -= mouse_force.x * 12 * time_step;
	camera.tilt += mouse_force.y * 8 * time_step;
	camera.tilt = clamp(camera.tilt,-30,10);
	temp = fcos(camera.tilt,-camera_distance);
	vec_set(camera.x,vector(my.x + fcos(camera.pan,temp),my.y + fsin(camera.pan,temp),my.z + 20 + fsin(camera.tilt,-camera_distance)));

	vec_diff(temp.x,camera.x,my.x); //find the vector from the player to the camera
	vec_normalize(temp.x,16); //get the magnitude of it's vector to 16 quants and store it in temp
	vec_add(temp.x,camera.x); //add the vector (from player to camera) of a magnitude of 16 quants and add it to the camera's position.

	trace_mode = ignore_me+ignore_passable;
	result = trace(my.x,temp.x); //trace from the player to 16 quants behind the camera.
	IF (result > 0) 
        {
		vec_diff(temp.x,my.x,target.x); //find the vector from the point the trace hit to the player
		vec_normalize(temp.x,16); //get the magnitude of this vector to 16 quants and store in temp
		vec_set(camera.x,target.x); //place the camera at the trace hit point
		vec_add(camera.x,temp.x); //move the camera away from the wall by the vector temp, 16 quants towards the player

	}

}