small changes

index.html

@@ -142,7 +142,7 @@
 
                 vec3 nominalDist = neighborOriginalPosition-originalPosition;
                 vec3 deltaP = neighborLastPosition-lastPosition+nominalDist;
-                deltaP -= normalize(deltaP)*length(nominalDist);
+                deltaP -= normalize(deltaP)*beamMeta[2];
                 vec3 deltaV = neighborLastVelocity-lastVelocity;
 
                 vec3 _force = deltaP*beamMeta[0] + deltaV*beamMeta[1];

js/GPUMath.js

@@ -9,7 +9,10 @@ function initGPUMath(){
 
     var canvas = document.getElementById("gpuMathCanvas");
     var gl = canvas.getContext("webgl", {antialias:false}) || canvas.getContext("experimental-webgl", {antialias:false});
-    gl.getExtension('OES_texture_float');
+    var floatTextures = gl.getExtension('OES_texture_float');
+    if (!floatTextures) {
+        console.warn('no floating point texture support');
+    }
     gl.disable(gl.DEPTH_TEST);
 
     var maxTexturesInFragmentShader = gl.getParameter(gl.MAX_TEXTURE_IMAGE_UNITS);

js/dynamicModel.js

@@ -285,7 +285,7 @@ function initDynamicModel(globals){
         lastVelocity = new Float32Array(textureDim*textureDim*4);
         externalForces = new Float32Array(textureDim*textureDim*4);
         mass = new Float32Array(textureDim*textureDim*4);
-        meta = new Float32Array(textureDim*textureDim*4);//todo uint16
+        meta = new Float32Array(textureDim*textureDim*4);
         beamMeta = new Float32Array(textureDimEdges*textureDimEdges*4);
 
         for (var i=0;i<textureDim*textureDim;i++){