Unity on GameSweetGame

Fix Character Movement Stutter in Unity

Fri, 20 Feb 2026 12:31:00 +0900

Check if Min Move Distance is set to 0 in your Character Controller.

I spent a long time tweaking movement code trying to figure out why the character was stuttering. Turns out, setting Min Move Distance to 0 fixed it right away.

Extract Animation Clips from FBX in Unity

Tue, 10 Feb 2026 11:29:00 +0900

Select the FBX file and press Ctrl+D to duplicate just the animation clip.

Make sure to finalize all settings before extracting.

Unity Editor Crash Fix: D3D11 Swapchain Device Reset/Removed

Wed, 28 Jan 2026 00:00:00 +0900

I was working in Unity when suddenly the editor crashed with a D3D11 swapchain error — “Failed to present D3D11 swapchain due to device reset/removed.”

After reopening, it would crash within 3 seconds every time.

I tried everything — reinstalling Unity, changing versions — nothing worked.

I initially suspected Wallpaper Engine conflicting with DirectX in the background, but that wasn’t it either.

The key symptom was that the editor was sluggish and unresponsive, but the scene and game view rendered fine before crashing. This suggested it wasn’t a rendering issue but something loading in the background.

Then I noticed Windows Defender.

The fix: Allow the Unity Editor and Unity Package Manager through Windows Defender Firewall.

My theory: Unity tries to communicate with Package Manager and other services on startup. The firewall blocks these requests, stalling the main thread, causing GPU timing to slip, and eventually triggering the D3D11 device reset.

Visualize Character Field of View with Unity Gizmos

Thu, 13 Mar 2025 00:00:00 +0900

Unity has built-in Gizmo functions that get called automatically.

OnDrawGizmos()

Always visible in the Scene view.

OnDrawGizmosSelected()

Only visible when the object is selected in the Scene view.

Great for visualizing field of view, attack range, and other debug shapes.

Unity Sword Trail Effect

Fri, 21 Feb 2025 00:00:00 +0900

I added basic attack animations to my character controller.

Swinging the sword felt empty. Games I’ve played always had that afterimage trail effect when swinging fast.

Implementation

Generate a mesh along the sword’s trajectory.

Draw a texture on the mesh and push it with a shader. The timing needs to follow right behind the sword’s path.

To sync the timing, adjust the shader texture Offset while watching the sword in the animation.

After searching for how animation stores shader texture values, I found Material._MainTex_ST.

Now I can control shader values through animation.

Tip: Set the shader texture mode to Clamp instead of Wrap. Otherwise the texture keeps repeating. With Clamp, it extends the last pixel seamlessly.

Basic sword trail effect done. Next step: make it 3D and add more options for fancier effects.

Extra Tip

When keying the animation, use the Broken tangent option to prevent the texture from visibly snapping back to the start when the attack animation ends.