public static Mesh3D CreateQuad(float w, float h, Color4 color)
{
var mesh = new Mesh3D(4, 6);
var a = new Vertex3D(new Vector3(w * 0.5f, h * 0.5f), Vector3.Forward, new Vector2(0f, 0f), color);
var b = new Vertex3D(new Vector3(w * -0.5f, h * 0.5f), Vector3.Forward, new Vector2(1f, 0f), color);
var c = new Vertex3D(new Vector3(w * -0.5f, h * -0.5f), Vector3.Forward, new Vector2(1f, 1f), color);
var d = new Vertex3D(new Vector3(w * 0.5f, h * -0.5f), Vector3.Forward, new Vector2(0f, 1f), color);
mesh.AddQuad(ref a, ref b, ref c, ref d);
mesh.CalculateNormals();
mesh.Update();
return(mesh);
}
public static Mesh3D CreateSphere(float radius, int segmentsW, int segmentsH, Color4 color)
{
float tdelta = 360f / segmentsW;
float pdelta = 180f / segmentsH;
++segmentsW;
++segmentsH;
float phi = -90f;
Vector3 v;
var mesh = new Mesh3D(24, 36);
mesh.SetVertexCount(segmentsW * segmentsH);
mesh.SetIndexCount((segmentsW - 1) * (segmentsH - 1) * 6);
int n = 0;
for (int i = 0; i < segmentsH; i++)
{
float theta = 0f;
for (int j = 0; j < segmentsW; j++)
{
v.X = radius * Calc.Cos(phi * Calc.PI / 180f) * Calc.Cos(theta * Calc.PI / 180f);
v.Y = radius * Calc.Sin(phi * Calc.PI / 180f);
v.Z = radius * Calc.Cos(phi * Calc.PI / 180f) * Calc.Sin(theta * Calc.PI / 180f);
mesh.vertices[n].Pos = v;
mesh.vertices[n].Nor = v.Normalized;
mesh.vertices[n].Tex = new Vector2(theta / 360f, (phi + 90f) / 180f);
mesh.vertices[n].Col = color;
theta += tdelta;
++n;
}
phi += pdelta;
}
n = 0;
for (int i = 0; i < segmentsH - 1; i++)
{
for (int j = 0; j < segmentsW - 1; j++)
{
mesh.SetTriangle(n++, (i + 1) * segmentsW + j, (i + 1) * segmentsW + j + 1, i * segmentsW + j + 1);
mesh.SetTriangle(n++, i * segmentsW + j + 1, i * segmentsW + j, (i + 1) * segmentsW + j);
}
}
mesh.CalculateNormals();
mesh.Update();
return(mesh);
}