public CVector4(CVector3 v)
{
this.x = v.x;
this.y = v.y;
this.z = v.z;
this.w = 1.0f;
}
public void Set(CVector3 v)
{
this.x = v.x;
this.y = v.y;
this.z = v.z;
this.w = 1.0f;
}
/// <summary>
/// 外積を求める
/// </summary>
/// <param name="v1">入力ベクトル1</param>
/// <param name="v2">入力ベクトル2</param>
/// <returns>外積ベクトル</returns>
public static CVector3 Cross(CVector3 v1, CVector3 v2)
{
CVector3 v = new CVector3();
v.x = v1.y * v2.z - v1.z * v2.y;
v.y = v1.z * v2.x - v1.x * v2.z;
v.z = v1.x * v2.y - v1.y * v2.x;
return(v);
}
/// <summary>
/// 法線ベクトルを求める
/// </summary>
/// <param name="v1">入力ベクトル1</param>
/// <param name="v2">入力ベクトル2</param>
/// <param name="v3">入力ベクトル3</param>
/// <returns>法線ベクトル</returns>
public static CVector3 Normal(CVector3 v1, CVector3 v2, CVector3 v3)
{
CVector3 v = new CVector3();
CVector3 a = new CVector3();
CVector3 b = new CVector3();
a = v2 - v1;
b = v3 - v2;
v = CVector3.Cross(a, b);
v = v.Normalize();
return(v);
}
// 評価
public override bool Equals(object obj)
{
if (obj == null)
{
return(false);
}
CVector3 v = obj as CVector3;
if ((object)v == null)
{
return(false);
}
return((this.x == v.x) && (this.y == v.y) && (this.z == v.z));
}
public CVector3(CVector3 v)
{
this.x = v.x;
this.y = v.y;
this.z = v.z;
}
/// <summary>
/// 内積を求める
/// </summary>
/// <param name="v1">入力ベクトル1</param>
/// <param name="v2">入力ベクトル2</param>
/// <returns>内積値</returns>
public static float Dot(CVector3 v1, CVector3 v2)
{
return(v1.x * v2.x + v1.y * v2.y + v1.z * v2.z);
}
/// <summary>
/// 3方向ベクトルと4x4行列の積
/// 備考:4行目の行列には1をかけます
/// </summary>
/// <param name="dv">出力先ベクトル</param>
/// <param name="v">計算用ベクトル</param>
/// <param name="m">計算用行列</param>
public static void MatApply3(CVector3 dv, CVector3 v, CMatrix4 m)
{
dv.x = v.x * m.m[0, 0] + v.y * m.m[1, 0] + v.z * m.m[2, 0] + 1.0f * m.m[3, 0];
dv.y = v.x * m.m[0, 1] + v.y * m.m[1, 1] + v.z * m.m[2, 1] + 1.0f * m.m[3, 1];
dv.z = v.x * m.m[0, 2] + v.y * m.m[1, 2] + v.z * m.m[2, 2] + 1.0f * m.m[3, 2];
}
