threex.geometricglow

threex.geometricglow is a three.js extension to make any object glow at geometric level. It is done at the geometry level. An important feature which provide multiple advantages.

• the 'glow' is a mesh. so you can add it in your scene whenever you want.
• It isnt in screenspace. so simpler to handle and easier to tune
  • screenspace glow may have a single glow level no matter the depth of the glowing object.

It is released under MIT License.

Notes

• normalMatrix is in view coordinates
  • deduced from https://github.com/mrdoob/three.js/blob/master/src/renderers/WebGLRenderer.js#L5668
• cameraPosition is in world coordinates
  • deduced from https://github.com/mrdoob/three.js/blob/master/src/renderers/WebGLRenderer.js#L5165
• modelMatrix is object3dmatrixWorld

Examples

• Geometric Glow Mesh examples show how to easily get a prebuilt glow mesh.
• Atmosphere Material shows how to use the atmosphere material
• Dilate Geometry shows how to dilate/erode a geometry (and yes this is different than object.scale :)

bugs

• dilation fails: seems to fails on eroded cube
• formula for dot()
  • fix viewVector is false... better to take vector from vertex to camera

threex.geometricglowmesh.js

Try this Geometric Glow Mesh and its source. It will shows you how to build a geometric glow mesh. It depends on threex.atmospherematerial.js and threex.dilategeometry.js. How to create a glowMesh for a mesh ? just like this.

var glowMesh	= new THREEx.GlowMesh(mesh);
mesh.add(glowMesh)

example of customization of the default glowMesh

var insideUniforms	= glowMesh.insideMesh.material.uniforms
insideUniforms.glowColor.value.set('hotpink')
var outsideUniforms	= glowMesh.outsideMesh.material.uniforms
outsideUniforms.glowColor.value.set('hotpink')

to help fine tuning you may use dat.gui helpers.

var datGUI	= new dat.GUI()
new THREEx.addAtmosphereMaterial2DatGui(glowMesh.insideMesh.material, datGUI)	
new THREEx.addAtmosphereMaterial2DatGui(glowMesh.outsideMesh.material, datGUI)	

threex.dilategeometry.js

It dilates a geometry along the vertex normals. Note that it isnt to be confused with object3d.scale. Scale changes the size but independantly of the vertex normal. Try this example and its source. It shows how to dilate/erode a geometry. To dilate a geometry by 5%, just do

THREEx.dilateGeometry(geometry, 0.05)

threex.atmospherematerial.js

It provides a material which shine on border, like the earth atmostphere when you look at it from space. To create it, use the following line.

var material	= THREEx.createAtmosphereMaterial()

It is a THREE.ShaderMaterial that you can tune thru its uniforms. Here is a possible customisation.

material.uniforms.glowColor.value	= new THREE.Color('cyan')
material.uniforms.coeficient.value	= 1.1
material.uniforms.power.value		= 0.7


For fine tuning, you can use datGUI

```javascript
var datGUI	= new dat.GUI()
new THREEx.addAtmosphereMaterial2DatGui(material, datGUI)