Rev bounds

axes.js

@@ -413,7 +413,7 @@ proto.draw = function(params) {
       var v = (i + 1 + (j^1)) % 3
       if(this.zeroEnable[v]) {
         //Check if zero line in bounds
-        if(bounds[0][v] <= 0 && bounds[1][v] >= 0) {
+        if(Math.min(bounds[0][v], bounds[1][v]) <= 0 && Math.max(bounds[0][v], bounds[1][v]) >= 0) {
           this._lines.drawZero(u, v, this.bounds, x, this.zeroLineColor[v], this.zeroLineWidth[v]*this.pixelRatio)
         }
       }

lib/shaders/backgroundFrag.glsl

@@ -5,7 +5,7 @@ uniform vec4 colors[3];
 varying vec3 colorChannel;
 
 void main() {
-  gl_FragColor = colorChannel.x * colors[0] + 
+  gl_FragColor = colorChannel.x * colors[0] +
                  colorChannel.y * colors[1] +
                  colorChannel.z * colors[2];
 }

lib/shaders/backgroundVert.glsl

@@ -8,11 +8,19 @@ uniform vec3 bounds[2];
 varying vec3 colorChannel;
 
 void main() {
-  if(dot(normal, enable) > 0.0) {
-    vec3 nPosition = mix(bounds[0], bounds[1], 0.5 * (position + 1.0));
+
+  vec3 signAxis = sign(bounds[1] - bounds[0]);
+
+  vec3 realNormal = signAxis * normal;
+
+  if(dot(realNormal, enable) > 0.0) {
+    vec3 minRange = min(bounds[0], bounds[1]);
+    vec3 maxRange = max(bounds[0], bounds[1]);
+    vec3 nPosition = mix(minRange, maxRange, 0.5 * (position + 1.0));
     gl_Position = projection * view * model * vec4(nPosition, 1.0);
   } else {
     gl_Position = vec4(0,0,0,0);
   }
-  colorChannel = abs(normal);
+
+  colorChannel = abs(realNormal);
 }