Displaying a Voxel-Based World Pixel-Perfectly, but Experiencing Jitter

[aoisensi]

Godot Version

4.3

Question

I’m trying to render a voxel-based 3D world in Godot with pixel-perfect accuracy.

I’ve set the camera to a 45° downward angle and switched to an orthographic projection. To maintain a consistent ratio for the surfaces on the screen, I applied a Y-scale of sqrt(2.0) to the screen.

However, the result isn’t perfect—some lines appear misaligned.

How can I fix this issue?

Video: https://cdn.discordapp.com/attachments/137811595609899010/1334068045420826647/Pixel3D_DEBUG_2025-01-29_16-41-23.mp4?ex=679b2f2f&is=6799ddaf&hm=ab0a349da954d31d9962eb1a03860cb22a9fb50f03e35ea5b7ade8a0b3e8dd01&
Sample Project: https://cdn.discordapp.com/attachments/137811595609899010/1334068455850250281/pixel3d.zip?ex=679b2f91&is=6799de11&hm=1ddcbe51896305c2c11894f14fa78a8724dd601a5d280f1b25595d16e430ee82&

[pennyloafers]

I bet your z motion is not quantized to the pixel step. Maybe your y scaling is effecting the movement requirments.

Why pick an irrational number for the scale when computers have finite resolution in floating point numbers?

[aoisensi]

It already has rounded camera position.

Why pick an irrational number?
Because this one need it.

[pennyloafers]

And get rid of your scale

[aoisensi]

It doesn’t help.
And I cannot use stretch option for other some reason.

[pennyloafers]

to make it sable you need to move the z axis by sqrt of 2

I played around some more. The most important thing is the camera z movement. To get better pixels from the scene, just move the mesh around around so it sits better with the quantized camera.

[aoisensi]

Almost solved.
The key was using TextureRect instead of SubViewportContainer.
And I made the size of the SubViewport 8 times larger than the canvas. (2560x1018 in this case)
And I could achieve almost pixel-perfect by scaling down with TextureRect at nearest.