3d - Making an object fit exactly inside the camera frustum in Three.Js -


i trying make object fit inside camera frustum, , went through trigonometry that, , code used.

var setupcamera = function() {     aspectratio = window.innerwidth / window.innerheight     camera = new three.perspectivecamera( 45, aspectratio, 1, 10000 );     scene.add(camera); }  var updatecamera = function() {     var height = mesh1_bb.max.y;      var width = mesh1_bb.max.x - mesh1_bb.min.x;     var vertical_fov = camera.fov * (math.pi/ 180);      var max_z = mesh1_bb.max.z;      var horizontal_fov = 2 * math.atan (math.tan (vertical_fov/2) * aspectratio);      var distance_vertical = height / (2 * math.tan(vertical_fov/2));     // alert ('vertical' + distance_vertical);     var distance_horizontal = width / (2 * math.tan(horizontal_fov/2));     // alert ('horizontal' + distance_horizontal);     var z_distance = distance_vertical >= distance_horizontal? distance_vertical : distance_horizontal;      camera.position.z = z_distance + max_z;     camera.position.y = 0 ;     camera.position.x = 0; }

while think calculation camera distance correct, result get: enter image description here

i thought issue changing y position of camera, , put camera.position.y = height; get:

enter image description here

the result want following (which obtained panning right-click button of mouse , dragging until fitted whole canvas frame): enter image description here

i hope can because has been driving me crazy day long ;-)

thanks lot!

i have not checked distance calculations, looking straight down z-axis, while object isn't vertically centered around 0. putting camera.y @ mesh1_bb.max.y / 2 should fix that.

if don't want move camera, @ least point towards actual center of object. in case, using (axis aligned) bounding box isn't 100% correct anymore.


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