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POthree.js - fragment shader basics - color a fragment by it's position
 

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  1. POthree.js - fragment shader basics - color a fragment by it's position
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    <p>I try to color the fragments in my shader according to their position between highest and lowest vertex. Here are the shaders:</p> <pre><code>&lt;script type="x-shader/x-vertex" id="vertexshader"&gt; uniform float span; attribute float displacement; varying vec3 vNormal; varying float color_according_to_z; float z_actual; void main() { vNormal = normal; vec3 newPosition = position + normal * vec3(0.0, 0.0, displacement); gl_Position = projectionMatrix * modelViewMatrix * vec4(newPosition, 1.0); z_actual = gl_Position.z + span / 2.0; color_according_to_z = 1.0 / span * z_actual; } &lt;/script&gt; &lt;script type="x-shader/x-fragment" id="fragmentshader"&gt; uniform float span; varying float color_according_to_z; void main() { gl_FragColor = vec4(color_according_to_z, 0.5, 0.5, 1.0); } &lt;/script&gt; </code></pre> <p>Here is my render function:</p> <pre><code>function render() { requestAnimationFrame(render); plane.rotation.x = global_x_rotation; plane.rotation.z = global_z_rotation; for(var i = attributes.displacement.value.length - 1; i &gt;= 0; i--) { attributes.displacement.value[i] = attributes.displacement.value[i] - 0.5 + Math.random(); }; uniforms.lowest = attributes.displacement.value.min(); uniforms.highest = attributes.displacement.value.max(); uniforms.span = uniforms.highest - uniforms.lowest; attributes.displacement.needsUpdate = true; uniforms.lowest.needsUpdate = true; uniforms.highest.needsUpdate = true; uniforms.span.needsUpdate = true; renderer.render(scene, camera); } </code></pre> <p>I change the displacement from frame to frame and the recalculate the span between the highest and the lowest vertices.</p> <p>The final piece, how to paint a fragment according to it's position towards highest or lowest, I couldn't figure out yet.</p> <p><strong><a href="http://jsfiddle.net/ichbinadrian/c2jry/" rel="nofollow">Here is a jsfiddle with the mentioned code.</a></strong></p>
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    1. USthgie
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    1. COWithout trying your code it looks to me like you already have what you need. What are you seeing? Can you post a screenshot?
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      1. POthree.js - fragment shader basics - color a fragment by it's position
      1. USRob Agar
    2. COI made you a little screen recording: http://cl.ly/3I3D0D3l3C1Q. The vertices move just fine, but the coloring doesn't work.
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      1. POthree.js - fragment shader basics - color a fragment by it's position
      1. USthgie
    3. COnot sure if I want to open something called "shagging.mov" at work =O
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      1. POthree.js - fragment shader basics - color a fragment by it's position
      1. USRob Agar
 

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