Shader on Sprite3D doesn't work on all images

LouisSimon22

Hello everyone,

I was playing around with shaders on Sprite3D. Here's my simple shader (it hides pixels whose X is greater than progress):

shader_type spatial;

uniform sampler2D texture_albedo : hint_albedo;
uniform float progress: hint_range(0, 1);

void fragment() {
	vec4 albedo_tex = texture(texture_albedo, UV);
	ALBEDO = albedo_tex.rgb;
	ALPHA = ceil(progress - UV.x);
}

I apply it on the sprite3D through an override shader material.

Is the problem with the image or with the shader? Demo

Here's the original image Here's the image

TwistedTwigleg

I think the issue is the shader is not taking the image's alpha into account, which is why the image is all black.

I made a few adjustments, and while I have not tested it, I believe the shader should now take the alpha of the image into account, while also working with the progress range.

shader_type spatial;
uniform sampler2D texture_albedo : hint_albedo;
uniform float progress: hint_range(0, 1);
void fragment()
{
	vec4 albedo_tex = texture(texture_albedo, UV);
	ALBEDO = albedo_tex.rgb;
	ALPHA = albedo_tex.a;
	
	// May need to be flipped. I do not remember if UVs start at 1 or 0...
	if (UV.x > progress)
	{
		ALPHA = 0;
	}
}

LouisSimon22

Thanks again TwistedTwigleg.