Following is my current camera code that allows for pan, tilt and zoom using the mouse. What I'm now trying to add is object detection so that the camera dosn't get blocked from viewing the player entity. However, I'm having no luck with this. In fact, when ever I try to set the camera postion relivtive to the target returned by c_trace I get a hard crash.

Any ideas?


if(mouse_right)
{
cam_ang.pan+=rotspd*mouse_force.x;
cam_ang.tilt+=rotspd*mouse_force.y;
cam_ang.tilt=clamp(cam_ang.tilt,minang,maxang);
}
// orbit no tilt
if(mouse_left)
{
cam_ang.pan+=rotspd*mouse_force.x;
}

// zoom with mousewheel
cam_dist-=integer(mickey.z);
cam_dist=clamp(cam_dist,mindist,maxdist);

// do some trig to find camera location and then aim it at pFocus
camera.x=my_entity.x+cos(cam_ang.pan)*(cam_dist*cos(cam_ang.tilt));
camera.y=my_entity.y+sin(cam_ang.pan)*(cam_dist*cos(cam_ang.tilt));
camera.z=my_entity.z+sin(cam_ang.tilt)*cam_dist;
vec_set(temp,my_entity.x);
vec_sub(temp,camera.x);
vec_to_angle(camera.pan,temp);

// Find objects between player and camera. c_trace(my_entity.x,vector(camera.x,camera.y,camera.z),IGNORE_ME|IGNORE_PASSABLE|IGNORE_MODELS|IGNORE_SPRITES);
if(trace_hit == 1)
{
vec_set(miscTemp,target);
//vec_diff(miscTemp,camera,target);
//vec_set(cameraTPos,target);
// offset from the wall along normal by the near clipping dist
//vec_normalize(normal,(camera.clip_near/2));
//vec_add(cameraTPos,normal);
} else {vec_set(miscTemp,vector(0,0,0));}

Simple enough. Needed to move the collision detection before the trigonometry and have it modify the distance to target and then have my trig calcuations use that to figure out the postion.

Somthing like...


// zoom with mousewheel
cam_dist-=integer(mickey.z);
cam_dist=clamp(cam_dist,mindist,maxdist);

// Find objects between player and camera.
var dist=c_trace(my_entity.x,vector(camera.x,camera.y,camera.z),IGNORE_ME|IGNORE_PASSABLE|IGNORE_MODELS|IGNORE_SPRITES);
if(trace_hit == 1)
{
cam_dist=clamp(cam_dist,mindist,dist);
}

// do some trig to find camera location and then aim it at pFocus
camera.x=my_entity.x+cos(cam_ang.pan)*(cam_dist*cos(cam_ang.tilt));
camera.y=my_entity.y+sin(cam_ang.pan)*(cam_dist*cos(cam_ang.tilt));
camera.z=my_entity.z+sin(cam_ang.tilt)*cam_dist;
vec_set(temp,my_entity.x);
vec_sub(temp,camera.x);
vec_to_angle(camera.pan,temp);


Not perfect by a long shot, but a step in the right direction.