Three.js - JSONLoader with texture. Loading JSON into three.js. Recently I've been working on a project requiring rendering 3D VTK models into WebGL.
We're using three.js as the WebGL framework which has a JSON loader. So we require conversion from VTK to JSON, and it took a while to figure out how the JSON should be formatted for THREE.JSONLoader. The JSON file needs to have the following strings: The contents of the metadata tag is optional, and can be left empty. Scale sets the overall scaling of the scene. Faces use indexed set notation. The vertices are structured like so: [bitmask, x, y, z] where the 3D coordinates are x, y, z. This will create a face with the first (), second () and third () vertices in the vertex array. "faces" : [0, 0, 1, 2] This renders a triangle like so: Note that the face normals are on the wrong side! "faces" : [0, 0, 2, 1] WebGLShaders.js at r59 · mrdoob/three.js. » Subdivision surfaces with three.js KadrmasConcepts Blog. Subdivision surfaces are a technique for transforming a lower polygon model into a more detailed model.
The algorithm subdivides each face in a model into smaller faces, while maintaining the same approximate surface. The advantage when using subdivision surfaces are that the modeler can continue to work with the less detailed model. This makes the process easier since it is less to keep track of for the modeler.
Then when complete, the modeler can “bake” in the subdivisions to create a more detailed model. More Info on Subdivision Surfaces – Wikipedia. THREEx - Game Extensions for Three.js. AlteredQualia. Three.js - examples. Three.js Examples The goal of this collection is to provide a set of basic and instructive examples that introduce the various features in Three.js.
The source code for each page contains detailed comments. Hosted at GitHub. Total examples: 83. Last updated: 23 August 2013. Basic Examples • Hello World • Template • Info Box • Materials - Solid • Color Explorer • Wireframe • Lines and Dashed Lines • Helpers • Outline Effect • Face/Vertex Colors • Shapes • Extrusion • Text3D Texture Examples. Performance: Caching Material. This article is about performance and how caching can improve them.
In WebGL, it is important not to push the same textures multiple times to the GPU. It uselessly slow down the rendering. As a rules of thumbs, the less data are exchanged between the cpu and the gpu, the better it is for performance. Uniforms types · mrdoob/three.js Wiki. These mappings are also available since r68: These still work: Shader (GLSL)
The view below shows how a 3D image can be easily embedded in a web page. Click here to open in new window. Three.js and Babylon.js: a Comparison of WebGL Frameworks. Today’s web browsers have come a long way since the days of Sir Tim Berners-Lee and his Nexus software.
The most widespread Browsers like Chrome, Firefox, Safari, Opera and Internet Explorer support WebGL, the hardware accelerated OpenGL for browser. Learning pure WebGL from scratch is hard. So, why don't use a library which wraps WebGL and is easy to use? Physijs - a physics plugin for threejs. Examples Physics plugin for three.js Physijs brings a very easy to use interface to the three.js framework.