贴图，错切变换

作者： 作者的头像   东非肛肠科主任 ,  2024-07-21 22:02:47 ,  所有人可见 ,  阅读 1

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1.代码


void mainImage( out vec4 fragColor, in vec2 fragCoord ) {
 // 定义贴图坐标
    vec2 uv = fragCoord / iResolution.xy;

    mat3 m = mat3(1.0,0.0,0.0,
                  0.0,1.0,1.0,
                  0.0,0.0,1.0);
    vec3 uv2 = vec3(uv,1.0);
    vec3 uv3 = uv2 * m;
    vec3 c = texture(iChannel0, uv3.xy).rgb;
    fragColor = vec4(vec3(c), 1.0);
}

正常的图:
错切1.png

错切矩阵

mat3 m = mat3(1.0,0.0,0.0,
             -0.3,1.0,1.0,
              0.0,0.0,1.0);

效果:
错切2.png

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