Databases
StackOverflow2013
Postsdbo
POThree.js custom geometry problems with rotation
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POThree.js custom geometry problems with rotation
    primarykey
    data
    text
    <p>I have just started working with Javascript and specifically three.js. I have a custom Geometry that i have used to create a triangular prism. It has produced the correct shape but when it is rotated some of the faces don't look right. The other built in geometries (CubeGeometry, CylinderGeometry...) work just fine. Does it have to do with my custom Geometry or does it have something to do with lighting? Or the Mesh or Material?</p> <p>Here is the fiddle for an example of what is happening: <a href="http://jsfiddle.net/JLKCU/1/" rel="nofollow" title="3D Shapes Fiddle">3D Shapes Fiddle</a></p> <p>Here is the relevant code:</p> <pre><code>function getTriPrismGeometry(){ var geometry = new THREE.Geometry() geometry.vertices.push( new THREE.Vertex(new THREE.Vector3( -100, 100, 0 )) ); geometry.vertices.push( new THREE.Vertex(new THREE.Vector3( -100, -100, 0 ) )); geometry.vertices.push( new THREE.Vertex(new THREE.Vector3( 100, -100, 0 )) ); geometry.vertices.push( new THREE.Vertex(new THREE.Vector3( -100, 100, -100 )) ); geometry.vertices.push( new THREE.Vertex(new THREE.Vector3( -100, -100, -100 ) )); geometry.vertices.push( new THREE.Vertex(new THREE.Vector3( 100, -100, -100 )) ); geometry.faces.push( new THREE.Face3(0,1,2 ) ); geometry.faces.push( new THREE.Face3(3,4,0 ) ); geometry.faces.push( new THREE.Face3( 0, 1, 4 ) ); geometry.faces.push( new THREE.Face3( 1, 4, 5 ) ); geometry.faces.push( new THREE.Face3( 1, 2,5) ); geometry.faces.push( new THREE.Face3( 2, 0, 3 ) ); geometry.faces.push( new THREE.Face3( 2, 3, 5 ) ); geometry.faces.push( new THREE.Face3( 3,4, 5 ) ); geometry.computeCentroids(); geometry.computeFaceNormals(); geometry.computeVertexNormals(); init(geometry, true); } function init(geometry, isCustom) { camera = new THREE.PerspectiveCamera( 75, width/height, 1, 10000 ); camera.position.z = 300; scene = new THREE.Scene(); material = new THREE.MeshLambertMaterial( { color: 0xff0000 } ); mesh = new THREE.Mesh( geometry, material ); if (isCustom){ material.side = THREE.DoubleSide; mesh.doubleSided = true; } scene.add( mesh ); ambient = new THREE.AmbientLight( 0x101010 ); ambient.position.set(0, -70, 100).normalize(); scene.add( ambient ); directionalLight = new THREE.DirectionalLight( 0xffffff ); directionalLight.position = camera.position; scene.add( directionalLight );; } function animate() { // note: three.js includes requestAnimationFrame shim requestAnimationFrame( animate ); render(); } function render(){ var delta = Date.now() - start; directionalLight.position = camera.position; //mesh.position.y = Math.abs( Math.sin( delta * 0.002 ) ) * 150; mesh.rotation.x = delta * 0.0003; mesh.rotation.z = delta * 0.0002; renderer.render( scene, camera ); } </code></pre> <p>I am pretty new to three.js and especially 3D rendering and any help is appreciated. Thanks in advance!</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USScottyLa
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POThree.js custom geometry problems with rotation
      1. This table or related slice is empty.
      1. VTUpMod
    1. COYou may want to look at this issue listed on the main three.js site. The relevant part is the discussion about the near and far value of the camera and the object you are viewing and how polygons gets "clipped" which is a nice way of saying the polygon will not be drawn it exists outside the near and far values of the camera. It is a canvas renderer issue. https://github.com/mrdoob/three.js/issues/1035#issuecomment-3423126
      singulars
      1. POThree.js custom geometry problems with rotation
      1. USCrossphire Development
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload