Merge remote-tracking branch 'origin/master'

guoshilong

2023-02-21 63a2ad5c612192004cdca9b64194cd20089268a6

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uniform sampler2D depthTexture;
 
varying vec2 v_textureCoordinates;
 
void main(void)
{
    float depth = czm_readDepth(depthTexture, v_textureCoordinates);
    gl_FragColor = vec4(vec3(depth), 1.0);
}