4 Replies Latest reply on May 15, 2015 12:22 AM by Mathias Moehl

# 3D question.... (maybe a stupid question but) how to know if a 3D object is small versus far away?

im just getting into 3D animation with AE,  and im just wondering

when i create an object and try to fit it into a video.   how do i know if the object is really, lets say 10 foot away in virtual space,  or if it is twice or ten times that far away and just.... bigger

secondly,  does it matter?  are there certain properties to do with the animation of the object which would be different depending on these characteristics

• ###### 1. Re: 3D question.... (maybe a stupid question but) how to know if a 3D object is small versus far away?

If the virtual camera is moving, the distance from the camera will matter a great deal. If the camera isn't moving, it doesn't matter.

• ###### 2. Re: 3D question.... (maybe a stupid question but) how to know if a 3D object is small versus far away?

Hey djmattyz,

3D space is somewhat relative as mentioned above. Distance really becomes an issue when you start adding lights to your composition. The scale of your object and distance will be affected by the position and intensity of the lights.

If you are not using lights it really just matters what it looks like on screen. If it is "10 feet" or "100 feet" doesn't really matter if you like what you are seeing. My 2 cents and hope this helps!

J.

• ###### 3. Re: 3D question.... (maybe a stupid question but) how to know if a 3D object is small versus far away?

Also affected by z-space distance is the background movement relative to anything closer to the camera. If the background is farther away from a moving camera, it will move differently than if it was closer. That effect is called PARALLAX and has to do with the relative movement of objects in 3D space as the camera moves. Here's interesting video showing the parallax effect on a layered photo spread out in 3D space.

Steve

• ###### 4. Re: 3D question.... (maybe a stupid question but) how to know if a 3D object is small versus far away?

If you want to fit your 3d object into the scene, also note that objects that are far away are usually more desaturated and maybe blurry, because all the air between your eye and the object is in reality not "100% transparent".

Taking care of these details will make your compositing more realistic.