Simulating Isometric Cameras in Poser.

To do isometric, you absolutely must have an orthographic camera. This means, sort of, that the geometry when viewed through that camera doesn't have a vanishing point; two parallel lines will remain the same actual distance apart on screen, no matter how far away from you they go. If you don't have this, you can't "match up" your objects, because for cameras that do use a vanishing point, the rendered geometry depends on the how far the object is from the "lens".

Poser's camera is not orthographic; however, it appears that its directional views (e.g. front, left, etc.) are. So the trick in poser is to use one of those views, then rotate your objects relative to that camera.

Note, however, the settings mentioned in this post are not true isometric settings. The correct settings are mentioned above: 45 degrees in Y and -35.264 degrees in X.