您最多选择25个主题
主题必须以中文或者字母或数字开头，可以包含连字符 (-)，并且长度不得超过35个字符
32 行
1.1 KiB
32 行
1.1 KiB
#ifndef UNITY_QUATERNIONMATH_INCLUDED
|
|
#define UNITY_QUATERNIONMATH_INCLUDED
|
|
|
|
// Ref: https://cedec.cesa.or.jp/2015/session/ENG/14698.html The Rendering Materials of Far Cry 4
|
|
|
|
real4 TangentSpaceToQuat(real3 tagent, real3 bitangent, real3 normal)
|
|
{
|
|
real4 quat;
|
|
quat.x = normal.y - bitangent.z;
|
|
quat.y = tangent.z - normal.x;
|
|
quat.z = bitangent.x - tangent.y;
|
|
quat.w = 1.0 + tangent.x + bitangent.y + normal.z;
|
|
|
|
return normalize(quat);
|
|
}
|
|
|
|
void QuatToTangentSpace(real4 quaterion, out real3 tangent, out real3 bitangent, out real3 normal)
|
|
{
|
|
tangent = real3(1.0, 0.0, 0.0)
|
|
+ real3(-2.0, 2.0, 2.0) * quat.y * quat.yxw
|
|
+ real3(-2.0, -2.0, 2.0) * quat.z * quaternion.zwx;
|
|
|
|
bitangent = real3(0.0, 1.0, 0.0)
|
|
+ real3(2.0, -2.0, 2.0) * quat.z * quat.wzy
|
|
+ real3(2.0, -2.0, -2.0) * quat.x * quaternion.yxw;
|
|
|
|
normal = real3(0.0, 0.0, 1.0)
|
|
+ real3(2.0, 2.0, -2.0) * quat.x * quat.zwx
|
|
+ real3(-2.0, 2.0, -2.0) * quat.y * quaternion.wzy;
|
|
}
|
|
|
|
#endif // UNITY_QUATERNIONMATH_INCLUDED
|