How to fix ground plane

@mrburns, try this set up:
1. Add a ground plane to the default cube scene.
2. Move the default cube to a location above the ground plane.
3. Point the camera at the center of the cube.
4. Parent both the ground plane and the light source to the camera.
5. Disable panning in the Verge3D camera controls
6. Press sneak peek.

Technically, the cube is stationary and the world moves, but to the end-user, it seems that the cube is moving.

Here is a quick screen capture of these steps:

Here is a video of the result:

…(while tenting hands) excellent…

Hello @mrburns,
Please post your test Blend file to the thread and we can take a look at it.
1. I am not sure if you are saying that the cube is clipping the camera or if it is improperly framed by the web page in sneak peek mode. I think that this relates to your #3 question.
2. I suspect that you have an HDRI lighting your scene in addition to the point light that is parented to your camera. HDRIs do not move with the camera, so that might explain your color shift. You can test this. Go to the world tab. Deselect use nodes. Try sneak peek again.
3. The standard behavior of the v3d-container div is to fill whatever HTML container it is placed within. When you view the 3D scene in a browser, the container is a browser and it fills your screen. You could embed the V3D application in a simple 800x800px iframe and you will be guaranteed that your scene would render at 800x800px. There are other HTML techniques to do the same thing (and better) if you want to play with CSS. I suspect that this issue (#3) is the cause of your first issue. Your viewport in Blender has a different aspect ratio than your viewport in the browser. You have blender set to 1:1 and browsers are often close to 2:1 (depending on your monitor and a bunch of other factors). That could easily explain the undesired framing. You should also check your camera limits. If they are set to tight, your camera will be pushed towards the subject.
Again, if you could post your file, I could take a look.

…yep, what Yuri said. Use the Verge3D camera settings to point the camera at your desired spin-center (probably the center of your cube). Verge3D uses this setting to point the camera. It does not use the camera orientation from the Blender scene.

Yes, you can add more lights to brighten the scene. I will often use three-point lighting in my scene, but it is not a perfect replacement for an HDRI. HDRIs provide more realistic illumination, and multiple shadow casting lights are probably not a great idea because of technical limitations with realtime shaders on some platforms. I wonder if we can make the HDRI track with the camera? I did a simple experiment to do this with puzzles, but it produced weird results. Maybe someone from the Soft8soft team has a better approach?