Fixed problem with some parameters being optimized away by the GLSL...

samples/o3d-webgl-samples/pool.html

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 All rights reserved.
 
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@@ skipping 993 matching lines @@
   var eye = [0, 0, 0];
   var target = [0, 0, 0];
   g_cameraInfo.getEyeAndTarget(eye, target);
   g_shadowPassViewInfo.drawContext.view =
   g_viewInfo.drawContext.view = g_math.matrix4.lookAt(eye, target, [0, 0, 1]);
 
   updateMaterials();
 }
 
 
+function setOptionalParam(material, name, value) {
+  var param = material.getParam(name);
+  if (param) {
+    param.value = value;
+  }
+}
+
+
 function initMaterials() {
   g_materials = {
       'solid':{},
       'felt':{},
       'wood':{},
       'cushion':{},
       'billiard':{},
       'ball':{},
       'shadowPlane':{}};
 
@@ skipping 14 matching lines @@
     effect.loadPixelShaderFromString(pixelShaderString + mainString);
 
     material.effect = effect;
     effect.createUniformParameters(material);
     material.drawList = g_viewInfo.performanceDrawList;
 
     var eye = [0, 0, 0];
     var target = [0, 0, 0];
     g_cameraInfo.getEyeAndTarget(eye, target);
 
-    material.getParam('factor').value = 2 / g_tableWidth;
-    material.getParam('lightWorldPosition').value = g_light;
-    material.getParam('eyeWorldPosition').value = eye;
+    setOptionalParam(material, 'factor', 2 / g_tableWidth);
+    setOptionalParam(material, 'lightWorldPosition', g_light);
+    setOptionalParam(material, 'eyeWorldPosition', eye);
   }
 
   g_solidMaterial = g_materials['solid'];
   g_solidMaterial.drawList = g_hudViewInfo.zOrderedDrawList;
 
   g_materials['shadowPlane'].drawList = g_shadowPassViewInfo.zOrderedDrawList;
 
   g_shadowSampler = g_pack.createObject('Sampler');
   g_shadowSampler.texture = g_shadowTexture;
   g_materials['felt'].getParam('textureSampler').value = g_shadowSampler;
 
   o3djs.io.loadBitmaps(g_pack,
       o3djs.util.getAbsoluteURI('../assets/poolballs.png'),
       finishLoadingBitmaps);
 }
 
 
 function updateMaterials() {
   for (name in g_materials) {
     var eye = [0, 0, 0];
     var target = [0, 0, 0];
     g_cameraInfo.getEyeAndTarget(eye, target);
-    g_materials[name].getParam('eyeWorldPosition').value = eye;
+    setOptionalParam(g_materials[name], 'eyeWorldPosition', eye);
   }
 }
 
 
 /**
  * Gets called back when the bitmap has loaded.
  */
 function finishLoadingBitmaps(bitmaps, exception) {
   var bitmap = bitmaps[0];
 
@@ skipping 1040 matching lines @@
   }
 
 </textarea>
 <!-- End of effect -->
 </div>
 
 </body>
 </html>