可视范围shader的acos可以替换成fastacos,修正artifact #1
Description
float fastacos(float x) {
return (-0.69813170079773212 * x * x - 0.87266462599716477) * x + 1.5707963267948966;
}
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float fastacos(float x) {
return (-0.69813170079773212 * x * x - 0.87266462599716477) * x + 1.5707963267948966;
}