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Question: I dont understand the position variable in shader? #48

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zhanglq2024 opened this issue Mar 29, 2024 · 0 comments

zhanglq2024 commented Mar 29, 2024 •

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const triangleVertices = new Float32Array([-2, -2, 2, -2, 2, 2, -2, 2]);

Why they are +-2?

position -> vPosition value never changed?

and what is meaning of the fragment shader

    float A = -dot(vPosition, vPosition);
    if (A < -4.0) discard;

Can some one give a brief explaination, appreciated.

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