Autodesk 12812-051462-9011 User Guide 3 - Page 2045

Make sure your animations never change the face or vertex count over time. VRML97 can not add or delete faces or vertices over time. CoordinateInterpolators support morphing a mesh only, not changing the number of vertices or faces. To trigger an animation that is not on an object at the top-level of the software's linking hierarchy, use a TimeSensor helper object. If you trigger an animation directly from a TouchSensor or ProximitySensor, without a TimeSensor, you can animate only top-level objects. Animating from TimeSensors does not have this limitation. Turn off the Generate Primitives toggle in the Export dialog if you animate the parameters of primitives (like the radius of a sphere), and want the animation exported with CoordinateInterpolators. This applies to box, sphere, cylinder and cone primitives only. Materials You can export only standard and multi/sub-object materials, and only the following components of the material: ■ Diffuse, ambient, and specular color ■ One texture map, which must be in the Diffuse channel Use JPEG or PNG format for your maps, because they are recognized by all VRML97-compliant browsers and generally create the smallest files. (Some older browsers may recognize GIF format and not PNG.) Multi/sub-object materials export colors and textures. If an object has a multi/sub-object material with textures, it exports as separate objects in VRML97, since VRML97 does not support more than one texture map per object. Texture maps slow down the browser and increase download time. Use them sparingly. ■ Shininess (but not shininess strength) ■ Opacity ■ Wire frame Make sure that all large flat surfaces have enough vertices in them that a few vertices can be seen from all reasonable vantage points in your scene. Some browsers cannot display textures on an object where all of its vertices are outside the current viewport. If you have several lights in you scene, lower the default multiplier value on all the lights in the scene. Lights can oversaturate the scene and make all your 7300 | Chapter 23 Managing Scenes and Projects