You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
72 lines
2.9 KiB
72 lines
2.9 KiB
2 years ago
|
( function () {
|
||
|
|
|
||
|
|
const _va = /*@__PURE__*/new THREE.Vector3(),
|
||
|
|
// from pe to pa
|
||
|
|
_vb = /*@__PURE__*/new THREE.Vector3(),
|
||
|
|
// from pe to pb
|
||
|
|
_vc = /*@__PURE__*/new THREE.Vector3(),
|
||
|
|
// from pe to pc
|
||
|
|
_vr = /*@__PURE__*/new THREE.Vector3(),
|
||
|
|
// right axis of screen
|
||
|
|
_vu = /*@__PURE__*/new THREE.Vector3(),
|
||
|
|
// up axis of screen
|
||
|
|
_vn = /*@__PURE__*/new THREE.Vector3(),
|
||
|
|
// normal vector of screen
|
||
|
|
_vec = /*@__PURE__*/new THREE.Vector3(),
|
||
|
|
// temporary vector
|
||
|
|
_quat = /*@__PURE__*/new THREE.Quaternion(); // temporary quaternion
|
||
|
|
|
||
|
|
/** Set a PerspectiveCamera's projectionMatrix and quaternion
|
||
|
|
* to exactly frame the corners of an arbitrary rectangle.
|
||
|
|
* NOTE: This function ignores the standard parameters;
|
||
|
|
* do not call updateProjectionMatrix() after this!
|
||
|
|
* @param {Vector3} bottomLeftCorner
|
||
|
|
* @param {Vector3} bottomRightCorner
|
||
|
|
* @param {Vector3} topLeftCorner
|
||
|
|
* @param {boolean} estimateViewFrustum */
|
||
|
|
function frameCorners( camera, bottomLeftCorner, bottomRightCorner, topLeftCorner, estimateViewFrustum = false ) {
|
||
|
|
|
||
|
|
const pa = bottomLeftCorner,
|
||
|
|
pb = bottomRightCorner,
|
||
|
|
pc = topLeftCorner;
|
||
|
|
const pe = camera.position; // eye position
|
||
|
|
const n = camera.near; // distance of near clipping plane
|
||
|
|
const f = camera.far; //distance of far clipping plane
|
||
|
|
|
||
|
|
_vr.copy( pb ).sub( pa ).normalize();
|
||
|
|
_vu.copy( pc ).sub( pa ).normalize();
|
||
|
|
_vn.crossVectors( _vr, _vu ).normalize();
|
||
|
|
_va.copy( pa ).sub( pe ); // from pe to pa
|
||
|
|
_vb.copy( pb ).sub( pe ); // from pe to pb
|
||
|
|
_vc.copy( pc ).sub( pe ); // from pe to pc
|
||
|
|
|
||
|
|
const d = - _va.dot( _vn ); // distance from eye to screen
|
||
|
|
const l = _vr.dot( _va ) * n / d; // distance to left screen edge
|
||
|
|
const r = _vr.dot( _vb ) * n / d; // distance to right screen edge
|
||
|
|
const b = _vu.dot( _va ) * n / d; // distance to bottom screen edge
|
||
|
|
const t = _vu.dot( _vc ) * n / d; // distance to top screen edge
|
||
|
|
|
||
|
|
// Set the camera rotation to match the focal plane to the corners' plane
|
||
|
|
_quat.setFromUnitVectors( _vec.set( 0, 1, 0 ), _vu );
|
||
|
|
camera.quaternion.setFromUnitVectors( _vec.set( 0, 0, 1 ).applyQuaternion( _quat ), _vn ).multiply( _quat );
|
||
|
|
|
||
|
|
// Set the off-axis projection matrix to match the corners
|
||
|
|
camera.projectionMatrix.set( 2.0 * n / ( r - l ), 0.0, ( r + l ) / ( r - l ), 0.0, 0.0, 2.0 * n / ( t - b ), ( t + b ) / ( t - b ), 0.0, 0.0, 0.0, ( f + n ) / ( n - f ), 2.0 * f * n / ( n - f ), 0.0, 0.0, - 1.0, 0.0 );
|
||
|
|
camera.projectionMatrixInverse.copy( camera.projectionMatrix ).invert();
|
||
|
|
|
||
|
|
// FoV estimation to fix frustum culling
|
||
|
|
if ( estimateViewFrustum ) {
|
||
|
|
|
||
|
|
// Set fieldOfView to a conservative estimate
|
||
|
|
// to make frustum tall/wide enough to encompass it
|
||
|
|
camera.fov = THREE.MathUtils.RAD2DEG / Math.min( 1.0, camera.aspect ) * Math.atan( ( _vec.copy( pb ).sub( pa ).length() + _vec.copy( pc ).sub( pa ).length() ) / _va.length() );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
THREE.CameraUtils = {};
|
||
|
|
THREE.CameraUtils.frameCorners = frameCorners;
|
||
|
|
|
||
|
|
} )();
|