Viewport visibility weirdness

#1

Hey All,

Wondered if this is happening to anyone else.
I’m working on a project where I need to align maps (geographic kind) in the viewport but placing one map above another in Y so I can scale and adjust position to match the one below.
Sometimes it works fine. Other times, I have to move the map above 5 cm in Y to make it visible above the map at 0 Y. My viewport sometimes will allow x-ray to work and other times not.

You’d think a plane with an image, placed at .01 cm in Y would be visible over a plane at 0Y but it doesn’t work.

Could it be a software bug or am I doing something silly?

Thanks,

Using the standard renderer, level of detail high, windows 10

#2

I’m confused, could you share some screenshots depicting your problem ?

#3

With .01 a plane will artifact somewhat in the viewport … but renders fine.
Placing a second plane at .o5 will not artifact and renders fine as well.

Putting the top plane in xray at .01 will appear below base plane at 0 …
but, renders fine.

#4

Thanks guys,

Here’s an example: Small map (Yellow) is at -1cm in Y (World)
Larger map is at 0cm in Y.

X-ray in viewport is OFF. X-ray in object attributes is OFF.

I shouldn’t be able to see the smaller map if it’s physically below the larger one?

image
image.jpg1065x717 202 KB

Here’s another issue. Spline with an extrude modifer (NGon). Extrude and spline at 2cm in Y and I get this distortion?

image
image.jpg1294x606 201 KB

I wonder if it’s a viewport setting or a video card issue? (NVIDIA GeForce RTX 2070 Super)
Drivers up to date…

#5

It’s a precision thing.

If you don’t work with perspective you can place objects with greater distance from each other and render with the orthogonal camera without seeing those artefacts.

#6

Yup. If I switch camera mode to Isometric (If that’s what you meant by Orthogonal Camera), it fixes the issue.
Definitely something to do with camera perspective.

#7

Yes, I meant Isometric.

#8

I still don’t understand what the issue is by using Perspective camera settings.
Surely this should be ‘precise’ too?

#9

I think it’s an OpenGL issue.

#10

Well thanks for the input Demis. Appreciate it.

#11

is this not just the document->viewport clipping?

i.e. reduce the far value, or increase the near value, etc.

best
Paul

#12

And the winner is…

VIEWPORT CLIPPING!

I’d unintentionally scaled up my scene to match the large res images I was using.
My scene was huge. Changing the viewport clipping solved the problem.

Thanks for everyone for their time and input in helping me not be such a dummy.
Stay safe out there!

#13

Where is all that ?
You mean Project -> View Clipping ?

I thought that was a camera/object setting and the problem was a between objects clipping thing…
Haven’t noticed there was a near/far user input either …

good to know, cause I had a clipping problem in the past when dealing with a 3D printed model in the mm scale and setting it to Tiny didn’t help.

#14

Ctrl+D to bring up Project settings.
As well as the standard dropdown viewport clipping (Tiny/Small/Medium/Large/Huge)
There’s a dropdown arrow that allows you to manually enter amounts.

Fixed my issue. See image:

Clipping
Clipping.PNG571x522 24.7 KB