Sunbeams
This project uses three.js. Make your choice and press reset.
- intersections between sunbeams and ground
This project uses three.js. Make your choice and press reset.
code
///////////////////////////////////
// ADD BUILDING /////////////
/* construct building */
var building = new THREE.Object3D();
for ( var i = 0; i < xSize; i++ ) {
for ( var j = 0; j < ySize; j++ ) {
for ( var k = 0; k < zSize; k++ ) {
/* cube */
var mGeometry = new THREE.BoxGeometry( boxSize, boxSize, boxSize );
var mMaterial = new THREE.MeshBasicMaterial( { color: 0xffff00 } );
var cube = new THREE.Mesh( mGeometry, mMaterial );
/* edges */
var mEdges = new THREE.EdgesGeometry( mGeometry );
var mLine = new THREE.LineSegments( mEdges, new THREE.LineBasicMaterial( { color: 0x0000ff } ) );
cube.add ( mLine );
//cube.userData = "isBuilding";
/* change position */
cube.position.x = ( i * boxSize ) - ((( xSize - 1 ) / 2 ) * boxSize );
cube.position.z = ( j * boxSize ) - ((( ySize - 1 ) / 2 ) * boxSize );
cube.position.y = ( k * boxSize ) + ( boxSize / 2 );
building.add ( cube );
}
}
}
scene.add ( building );
///////////////////////////////////
// CALCULATE INTERSECTION
/* midpoint of sun */
var Sx = sphere.position.x
var Sy = sphere.position.y
var Sz = sphere.position.z
/* the normal of the plane */
var Ex = pNormal.x
var Ey = pNormal.y
var Ez = pNormal.z
for (var i = 0; i < building.children.length; i++) {
/* midpoint of cubes */
var Mx = building.children[i].position.x
var My = building.children[i].position.y
var Mz = building.children[i].position.z
/* line: Sx + (Mx -Sx) * t; Sy + (My -Sy) * t; Sz + (Mz -Sz) * t;
plane: normal and pt (0,0,0) */
var t = ( - Ex * Sx - Ey * Sy - Ez * Sz ) / (Ex * Mx - Ex * Sx + Ey * My - Ey * Sy + Ez * Mz - Ez * Sz )
var ptX = Sx + ( Mx - Sx ) * t
var ptY = Sy + ( My - Sy ) * t
var ptZ = Sz + ( Mz - Sz ) * t
/* intersection point as sphere */
var iGeometry = new THREE.SphereGeometry( boxSize, 16, 16 );
var iMaterial = new THREE.MeshBasicMaterial( {color: 0x0fff00} );
var intersPt = new THREE.Mesh( iGeometry, iMaterial );
/* change position */
intersPt.position.x = ptX;
intersPt.position.y = ptY;
intersPt.position.z = ptZ;
scene.add( intersPt );
/* show sunlines */
var midPointSphere = sphere.position
var midPointMesh = intersPt.position
var dirGeometry = new THREE.Geometry();
dirGeometry.vertices.push( midPointSphere, midPointMesh );
var dirMaterial = new THREE.LineBasicMaterial({ color: 0x0f00ff });
var dirLine = new THREE.Line( dirGeometry, dirMaterial );
scene.add( dirLine );
if (program.get('showSunLines') == true) {
dirLine.visible = true
} else {
dirLine.visible = false
}
}
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