Hi, I have a few performance questions (I am fairly new to Java3D but has used OpenGL for quite some time)
1. --------------- There seem to be some people that think that java3D immediate mode is faster than compiled retained mode. However, in the Sun java3d faq it says the opposite. So which is fastest? (Disregarding ease of use) 2. --------------- It seems that everybody believes that the placement of viewer should be controlled in the transform just above the view platform. However, doing so to look in a certain direction using lookAt requires a matrix inversion (v is the Transform3D class above the Viewplatform): v.lookAt(cameraPos, endPoint, upVector); v.invert(); because of the way the modelview matrix is calculated. (See the Java3D 1.3 beta 1 spec pages 294 and 295). If I placed the same transform at the top of the scene graph and dropped the transform above the viewplatform I could avoid this invertion. Is there any way I can avoid the matrix invert while still placing the view transform as recommended? I would rather like to avoid compatibility mode since it is not recommended for java3D applications but just included to make porting easier. 3. ----------------- Does the scene graph compiler in Java3D 1.3 beta 1 merge Shape3D objects assuming: 1. They have the same Appearance object 2. They are transformed the same way, i.e. are in the same branch of the scene graph (there is some transforms but these are eliminated because no capability bits are set in them nor below them in the tree) I think I read somewhere that Shape3D objects have an overhead each - if they are not combined automatically, does this mean I should merge them manually for speed? =========================================================================== To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA3D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".
