Question 1

How do I install the CRT shader in Godot 3?

Accepted Answer

Follow the README steps: create a CanvasLayer, add a ColorRect child, load the crt_material.tres in its Material property. If the shader is empty, copy-paste the code from the shader file manually.

Question 2

Godot 3 CRT shader vs Lottes CRT shader – which is better for retro games?

Accepted Answer

This shader is tailored for Godot 3 with easy integration and customization, while Lottes shader is a generic GLSL option often used in other engines; choose this for Godot-specific workflows or Lottes for cross-engine portability.

Question 3

How to fix the shader showing as empty when loading the material?

Accepted Answer

As noted in the README, open the crt_shader.shader in a text editor, copy the code into Godot's Shader editor, and save it – this manual workaround is required due to potential import issues.

Question 4

What are the best settings for authentic scan lines in this CRT shader?

Accepted Answer

Set horizontal_scan_lines_amount to your window height and vertical_scan_lines_amount to width for default realism, then adjust opacity to avoid moire effects, as suggested in the parameter descriptions.

Question 5

Does this CRT shader work with Godot 4?

Accepted Answer

No, it's specifically designed for Godot 3; using it in Godot 4 would require porting the shader code, which isn't supported out-of-the-box.

Question 6

How does the CRT shader impact performance in Godot 3 games?

Accepted Answer

It adds post-processing overhead via a full-screen shader; performance depends on parameter complexity and target hardware, but the README lacks optimization tips, so test on low-end devices.

CRT Shader

What is CRT Shader?

Overview

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Pros & Cons

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Frequently Asked Questions