What the hell, part of your model disappears when you go near it?
Even thou this is more of a standard beginner issue I decided to post about this, there is an increasing amount of beginners who take interest in the awesome Cinema 4D so this issue is always current.
So you got your Cinema 4D open and started to model something awesome (of course...) and you zoomed in on the pesky little vertex that gives you trouble only to see that vertex and part of your model gets cut-off when you get close to it?!
No worries that is just something called Viewport Clipping
So why this is happening?
In 3D computer graphics, there is a thing called the "View Frustum" it is the region of space in the modeled world that may appear on the screen; it is the field of view of the camera in question.
Frustum "is a portion of a cone or a pyramid which remains after its upper part has been cut off by a plane parallel to its base, or which is intercepted between two such planes."
The "View Frustum" is the adaptation of (idealized) cone of vision that a camera or eye would have to the rectangular viewports typically used in computer graphics. The planes that cut the frustum perpendicular to the viewing direction are called the "near plane" (A) and the "far plane" (B). Objects closer to the camera than the "near plane" (A) or beyond the "far plane" (B) are not drawn. Sometimes, the "far plane" (B) is placed infinitely far away from the camera so all objects within the frustum are drawn regardless of their distance from the camera.
Viewing-frustum culling is the process of removing objects that lie completely outside the viewing frustum from the rendering process. Rendering these objects would be a waste of time since they are not directly visible.
A Practical Example
So in my case, as I demonstrate here is that my lighter is too close to the cameras "near plane" (A) so part of my model falls out of the "View Frustum" and that's why there seems to be missing a piece.
Well, how do we solve this issue? I really really would like to see my model up close and whole, probably you feel the same way so let's get on with it.
Thank god there is a quick and easy fix
1. Go to Edit menu
Select "Project Settings" from the bottom of the menu. Or press Ctrl + D
2. Find where it says "View Clipping"
You'll find it from the bottom half of the panel and next to it a dropdown menu where I suggest that you select either "Small" or depending on the size of your model "Tiny". Usually, the "Small" will suffice.
3. And Voilà, you can see your whole model again.
You can probably zoom even closer without the view clipping the model.
4. So what did actually happen?
When we changed the "View Clipping" to "Small" the "near plane" (A) moved closer to the camera, so the whole model fits inside the "View Frustum" therefore is fully visible.