/// <summary>
/// 两个颜色之间做插值
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
/// <param name="t"></param>
/// <param name="color"></param>
public static void Lerp(Color a, Color b, float t, ref Color color)
{
if (t <= 0)
{
color.r = a.r; color.g = a.g; color.b = a.b;
}
else if (t >= 1)
{
color.r = b.r; color.g = b.g; color.b = b.b;
}
else
{
color.r = MathUntil.Lerp(a.r, b.r, t);
color.g = MathUntil.Lerp(a.g, b.g, t);
color.b = MathUntil.Lerp(a.b, b.b, t);
}
}
/// <summary>
/// 插值生成新顶点(在屏幕空间，Z值是不需要进行差值的，只需要对x和y进行差值)
/// </summary>
/// <param name="v1"></param>
/// <param name="v2"></param>
/// <param name="t"></param>
/// <returns></returns>
public static void LerpColor(ref Vertex v, Vertex v1, Vertex v2, float t)
{
float Zt = 0;
if (v1.ZView != 0.0f && v2.ZView != 0.0f)
{
Zt = MathUntil.Lerp(1f / v1.ZView, 1f / v2.ZView, t);
}
if (Zt != 0)
{
Zt = 1f / Zt;
}
v.ZView = Zt;
v.TexCoord.x = MathUntil.Lerp(v1.TexCoord.x, v2.TexCoord.x, t);
v.TexCoord.y = MathUntil.Lerp(v1.TexCoord.y, v2.TexCoord.y, t);
v.Color = Color.Lerp(v1.Color, v2.Color, t);
v.LightColor = Color.Lerp(v1.LightColor, v2.LightColor, t);
}
/// <summary>
/// 构造函数，输入分别为rgb三色
/// </summary>
/// <param name="r"></param>
/// <param name="g"></param>
/// <param name="b"></param>
public Color(float r, float g, float b)
{
mR = MathUntil.Range(r, 0, 1);
mG = MathUntil.Range(g, 0, 1);
mB = MathUntil.Range(b, 0, 1);
}