e triangle is degenerate. * * @param {Vector3} point - Position of interpolated point. * @param {Vector3} p1 - The first corner of the triangle. * @param {Vector3} p2 - The second corner of the triangle. * @param {Vector3} p3 - The third corner of the triangle. * @param {Vector3} v1 - Value to interpolate of first vertex. * @param {Vector3} v2 - Value to interpolate of second vertex. * @param {Vector3} v3 - Value to interpolate of third vertex. * @param {Vector3} target - The target vector that is used to store the method's result. * @return {?Vector3} The interpolated value. */ static getInterpolation( point, p1, p2, p3, v1, v2, v3, target ) { if ( this.getBarycoord( point, p1, p2, p3, _v3$2 ) === null ) { target.x = 0; target.y = 0; if ( 'z' in target ) target.z = 0; if ( 'w' in target ) target.w = 0; return null; } target.setScalar( 0 ); target.addScaledVector( v1, _v3$2.x ); target.addScaledVector( v2, _v3$2.y ); target.addScaledVector( v3, _v3$2.z ); return target; } /** * Computes the value barycentrically interpolated for the given attribute and indices. * * @param {BufferAttribute} attr - The attribute to interpolate. * @param {number} i1 - Index of first vertex. * @param {number} i2 - Index of second vertex. * @param {number} i3 - Index of third vertex. * @param {Vector3} barycoord - The barycoordinate value to use to interpolate. * @param {Vector3} target - The target vector that is used to store the method's result. * @return {Vector3} The interpolated attribute value. */ static getInterpolatedAttribute( attr, i1, i2, i3, barycoord, target ) { _v40.setScalar( 0 ); _v41.setScalar( 0 ); _v42.setScalar( 0 ); _v40.fromBufferAttribute( attr, i1 ); _v41.fromBufferAttribute( attr, i2 ); _v42.fromBufferAttribute( attr, i3 ); target.setScalar( 0 ); target.addScaledVector( _v40, barycoord.x ); target.addScaledVector( _v41, barycoord.y ); target.addScaledVector( _v42, barycoord.z ); return target; } /** * Returns `true` if the triangle is oriented towards the given direction. * * @param {Vector3} a - The first corner of the triangle. * @param {Vector3} b - The second corner of the triangle. * @param {Vector3} c - The third corner of the triangle. * @param {Vector3} direction - The (normalized) direction vector. * @return {boolean} Whether the triangle is oriented towards the given direction or not. */ static isFrontFacing( a, b, c, direction ) { _v0$2.subVectors( c, b ); _v1$5.subVectors( a, b ); // strictly front facing return _v0$2.cross( _v1$5 ).dot( direction ) < 0; } /** * Sets the triangle's vertices by copying the given values. * * @param {Vector3} a - The first corner of the triangle. * @param {Vector3} b - The second corner of the triangle. * @param {Vector3} c - The third corner of the triangle. * @return {Triangle} A reference to this triangle. */ set( a, b, c ) { this.a.copy( a ); this.b.copy( b ); this.c.copy( c ); return this; } /** * Sets the triangle's vertices by copying the given array values. * * @param {Array} points - An array with 3D points. * @param {number} i0 - The array index representing the first corner of the triangle. * @param {number} i1 - The array index representing the second corner of the triangle. * @param {number} i2 - The array index representing the third corner of the triangle. * @return {Triangle} A reference to this triangle. */ setFromPointsAndIndices( points, i0, i1, i2 ) { this.a.copy( points[ i0 ] ); this.b.copy( points[ i1 ] ); this.c.copy( points[ i2 ] ); return this; } /** * Sets the triangle's vertices by copying the given attribute values. * * @param {BufferAttribute} attribute - A buffer attribute with 3D points data. * @param {number} i0 - The attribute index representing the first corner of the triangle. * @param {number} i1 - The attribute index representing the second corner of the triangle. * @param {number} i2 - The attribute index representing the third corner of the triangle. * @return {Triangle} A reference to this triangle. */ setFromAttributeAndIndices( attribute, i0, i1, i2 ) { this.a.fromBufferAttribute( attribute, i0 ); this.b.fromBufferAttribute( attribute, i1 ); this.c.fromBufferAttribute( attribute, i2 ); return this; } /** * Returns a new triangle with copied values from this instance. * * @return {Triangle} A clone of this instance. */ clone() { return new this.constructor().copy( this ); } /** * Copies the values of the given triangle to this instance. * * @param {Triangle} triangle - The triangle to copy. * @return {Triangle} A reference to this triangle. */ copy( triangle ) { this.a.copy( triangle.a ); this.b.copy( triangle.b ); this.c.copy( triangle.c ); return this; } /** * Computes the area o