As an update, if I double the field of view to PI/2 instead of PI/4 distances look correct, but that introduces a fishbowl situation, since to see that much requires nasty bending. Still can't fugure this out. ----- Original Message ----- From: David <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Saturday, January 13, 2001 1:37 PM Subject: [JAVA3D] Perceived distance and size mystery We have been noticing something strange. Virtual distances seem closer than they really are. For example if we have the user's eye at 1.7 meters from the ground and there is an object 5 meters away, it looks like you are on top of it practically. I went into everquest (a 3d commercial world) and one thing I keep noticing is that the field of view is about half of what we are getting in Cosm. What controls the "feeling" distance from an object in 3d? I know the height from the ground is a big factor, as the brain seems to judge a first person perspective all in relation to this. But I am thinking field of view also plays a part in this. I know when I look at a object 12 feet high in our application it looks smaller than it really is. I think that is because my brain expects a certain relationship between field of view and eye height to properly gauge depth and size. I can't help but think that what I need to do is shrink the left/right range I can see and at the same time "push out" the scene so it appears deeper. I know I am not explaining this well. But for example a wall 3 meters high seems to be smaller than it really is. I have to move forward until it is practically in my face before it starts appearing "taller" than me. I was thinking if I made the field of view smaller this would reduce what I could see from left to right, but increase what I can see from top to bottom? Or am I crazy? I am attaching a picture. In this picture the box is calculated to be 10.3 meters from the view. The view "point" is calculated by getting the translation on the view transform. The distance is calculated to the center of the box. The view has been translated to be 1.7 meters above the ground, and there is a slight upward slope in the gound in this picture. The box itself has auto computed bounds to be a 1.5 meter radius, so assume that is to the corners, the box would be about 1.2 meters on a side. This just does not seem right to me. The box should look a LOT further away. In fact I would expect it to look 3 times further away than it appears. I eagerly await a solution to this mystery. Dave Yazel Cosm Development Team =========================================================================== 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".
