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I want to resize my texture. I am using cubemap to compute reflection. I want to use this cubemap to draw skybox. Skybox is drawn but I want to resize texture down, because it is dilated. As I wrote in my previous question (question), to draw skybox I use shaders:

I want to resize my texture. I am using cubemap to compute reflection. I want to use this cubemap to draw skybox. Skybox is drawn but I want to resize texture down, because it is dilated. As I wrote in my previous question (question), to draw skybox I use shaders:

    uniform mat4 modelViewMatrix;
  uniform mat4 projectionMatrix;
                                                  
    attribute vec4 position;
    varying mediump vec4 texCoord;
    void main() {
        
        gl_Position = projectionMatrix * modelViewMatrix * position;
        texCoord = modelViewMatrix * (gl_Position);
    }

    uniform mat4 modelViewMatrix;
  uniform mat4 projectionMatrix;
  uniform mat3 normalMatrix;
                                                  
    attribute vec4 position;
    varying mediump vec3 texCoord;
    void main() {
        
        gl_Position = projectionMatrix * modelViewMatrix * position;
        texCoord = normalMatrix * (gl_Position.xyz);
    }

Edit: It is strange, but when I multiply modelviewMatrix with projectionMatrix it does not work. Now my code is:

    uniform mat4 modelViewMatrix;
  uniform mat4 projectionMatrix;
                                                  
    attribute vec4 position;
    varying mediump vec4 texCoord;
    void main() {
        
        gl_Position = projectionMatrix * modelViewMatrix * position;
        texCoord = modelViewMatrix * (gl_Position);
    }

I have attached the screenshot, it looks quite good. Maybe it is distorted, because of the aspect ratio: