How to make a black sprite flashing white

Question

Note: doing a 2D project. in Godot 3.0.6

I noticed that the Modulate property can only brighten the sprite even if I set the color value higher than 1.0.

It doesn't help me since I have sprites with black(#000000) parts in them and they have to flash between white silhouette.

I tried:

• the shader from the second answer from here: https://godotengine.org/qa/20568/how-to-make-a-sprite-white?show=20568#q20568 And it only makes the black sprites to dull grey, rather than the clean white.
• setting Modulate color more than 1.0 https://www.reddit.com/r/godot/comments/7irdne/how_to_make_a_sprite_flashing_white/ As I already mentioned above, this just brightens the sprite a bit
• Light 2D node, it gives the same result. which is remaining the black parts of the sprite

Does anyone have a solution for this?

it's ridiculous to draw multiple white textures for each sprite animation frame.

Comments

Why you don't use animatedSprite?

I don't see how you could avoid creating white texture variants for most things. As pallet swaps are no longer supported in modern hardware.

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You can use shaders to do palette swaps fairly easily.

Answer 1

For anyone who was still searching for a solution to this (like me) as there is no easy way to do this exact thing yet, here is my solution:

1. Add a new ShaderMaterial to the Sprite you want to flash (if it
   already has a shader attached you can just add the code below to
   it).
2. Add a new Shader (not VisualShader) to the material.
3. Open the shader and add the following code:

.

shader_type canvas_item;

uniform float white_progress : hint_range(0,1) = 0;

vec3 interpolate_vec3(vec3 start, vec3 end, float delta){
    return start + (end - start) * delta;
}

void fragment(){
    vec4 origin = texture(TEXTURE, UV);
    COLOR.rgb = interpolate_vec3(origin.rgb, vec3(1,1,1), white_progress);
    COLOR.a = origin.a;
}

Now you can use an AnimationPlayer to change the "white_progress" in "Shader Param" to create a flashing sprite.