Wallpaper engine Modifying effects through a script

[MagnusWOAH]

I was messing around with the effects in wallpaper engine and I wanted to create an effect which allowed you to fade from one image to another using only one layer. I got to work and now I want to use a script to change the fade with user input.

To do this I need to modify the uniform float variable in the shader. I've gotten it to pick up the shader in the script and what it reads is accurate. However, when I modify the varible it doesn't update even though when logged it has updated.

This is the Shader

uniform float u_alpha; // {"material":"u_alpha","default":1,"range":[0,1], "hidden": false}

uniform sampler2D g_Texture0; // { "material": "tex1", "label": "Texture 1", "hidden": true}
uniform sampler2D g_Texture1; // { "material": "tex2", "label": "Texture 2"}

varying vec2 v_TexCoord;

void main() {
	vec4 col1 = texSample2D(g_Texture0, v_TexCoord.xy);
	vec4 col2 = texSample2D(g_Texture1, v_TexCoord.xy);

	gl_FragColor = mix(col1, col2, u_alpha);
}

This is the Script, it is attached to the u_alpha property of the effect

'use strict';
/**
 * @param {Number} value - for property 'alpha'
 * @return {Number} - update current property value
 */
export function init(value) {
	console.log(Object.getOwnPropertyNames(thisObject));
	console.log(thisObject.u_alpha);
	thisObject.u_alpha = 0.01;
	console.log(thisObject.u_alpha);

	return value;
}

The output looks like this

Log: u_alpha,depthwrite,depthtest,cullmode,alphawriting,blending,getAnimation
Log: 1
Log: 0.009999999776482582

As you can see the output is correct (I set the variable to 1 in the inspector before running the wallpaper) as it picks up and updates the u_alpha variable.

I'm mainly doing this out of curiosity and am not super knowledgeable about how all this works so if anyone can clarify what is happening here this would be Great.

[Astra18]

tremendo

[Gariam]

You are returning "value"

Also, you don't need to make a new shader for this, there's the blend effect that does exactly this.

[MagnusWOAH]

Gariam a écrit :

You are returning "value"

Also, you don't need to make a new shader for this, there's the blend effect that does exactly this.

Yeah this worked thanks. I didn't realise returning the value would block the shader variable from being updated.

[Gariam]

MagnusWOAH a écrit :

Yeah this worked thanks. I didn't realise returning the value would block the shader variable from being updated.

It was being updated, just with the same value it had before, overwriting your change.

[KalEl671]

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[furritobonitocaliente]

waos