Masking with soft edges

[Kotaiba]

What is the best way to mask with soft edges ,
I’ve tried ClippingNode ,but it will not do the effect that i need ,any idea how can i do that ?

[stevetranby]

Use a masking texture with a custom shader. Or find one pre-built.

Masking moving sprite with static sprite mask OR using a sprite mask to stencil a layer

Hi. I am attempting to render a complex space scene in which I have many sprites. I am using Cocos2d-x 2.2. I need the ability to mask a moving sprite with a static sprite or stencil a layer in the shape of the mask, both of which I am having problems with. I have been able to get the moving mask working but it relies on me shifting and updating the moving sprite every frame which becomes very slow. The code I am using for this is from https://github.com/syuhari/CCMask. I have also taken a look …

[Kotaiba]

@stevetranby
Is it possible to edit current ClippingNode to do that ?

[stevetranby]

Not really because clipping is done at a coarse pixel is ON or OFF. What you’re looking for requires alpha translucency.
Note: People are resourceful and clever and someone may have a way to use ClippingNode, but I would use a custom node+shader or a prebuilt masked sprite of some kind.

[Kotaiba]

Thank you ,I’ve managed to make it work ,i got small issue how can i update mask Coord .

_glprogramstateCB->setUniformVec2("v_maskCoord",MASKSPRITE COORD);

MASKSPRITE COORD?

i wanna move the mask around .

shader code

#ifdef GL_ES
precision mediump float;
#endif
varying vec4 v_fragmentColor;
varying vec2 v_texCoord;
uniform sampler2D u_mask;
uniform vec2 v_maskCoord;
void main(void) {
    vec4 texColor =texture2D(CC_Texture0, v_texCoord);
    vec4 maskColor = texture2D(u_mask, v_maskCoord);
   float alpha=maskColor.a-1.0;
    if (alpha<0.0) {
       alpha= alpha*-1.0;
    }
    gl_FragColor = texColor * alpha;
}

[stevetranby]

You probably need to use something like v_texCoord + v_maskCoord or something instead of just v_maskCoord when sampling the mask texture like that so that every pixel doesn’t use the same mask coordinate.

[Kotaiba]

Thank you , now everything is working perfectly .