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);
}
public static Mesh3D CreateBox(Vector3 size, Color4 color)
{
var mesh = new Mesh3D(24, 36);
mesh.SetVertexCount(24);
mesh.SetIndexCount(36);
size *= 0.5f;
mesh.SetVertex(0, new Vertex3D(new Vector3(1, 1, 1) * size, Vector3.Forward, new Vector2(0, 0), color));
mesh.SetVertex(1, new Vertex3D(new Vector3(-1, 1, 1) * size, Vector3.Forward, new Vector2(1, 0), color));
mesh.SetVertex(2, new Vertex3D(new Vector3(-1, -1, 1) * size, Vector3.Forward, new Vector2(1, 1), color));
mesh.SetVertex(3, new Vertex3D(new Vector3(1, -1, 1) * size, Vector3.Forward, new Vector2(0, 1), color));
mesh.SetVertex(4, new Vertex3D(new Vector3(-1, 1, -1) * size, Vector3.Back, new Vector2(0, 0), color));
mesh.SetVertex(5, new Vertex3D(new Vector3(1, 1, -1) * size, Vector3.Back, new Vector2(1, 0), color));
mesh.SetVertex(6, new Vertex3D(new Vector3(1, -1, -1) * size, Vector3.Back, new Vector2(1, 1), color));
mesh.SetVertex(7, new Vertex3D(new Vector3(-1, -1, -1) * size, Vector3.Back, new Vector2(0, 1), color));
mesh.SetVertex(8, new Vertex3D(new Vector3(-1, 1, 1) * size, Vector3.Left, new Vector2(0, 0), color));
mesh.SetVertex(9, new Vertex3D(new Vector3(-1, 1, -1) * size, Vector3.Left, new Vector2(1, 0), color));
mesh.SetVertex(10, new Vertex3D(new Vector3(-1, -1, -1) * size, Vector3.Left, new Vector2(1, 1), color));
mesh.SetVertex(11, new Vertex3D(new Vector3(-1, -1, 1) * size, Vector3.Left, new Vector2(0, 1), color));
mesh.SetVertex(12, new Vertex3D(new Vector3(1, 1, -1) * size, Vector3.Right, new Vector2(0, 0), color));
mesh.SetVertex(13, new Vertex3D(new Vector3(1, 1, 1) * size, Vector3.Right, new Vector2(1, 0), color));
mesh.SetVertex(14, new Vertex3D(new Vector3(1, -1, 1) * size, Vector3.Right, new Vector2(1, 1), color));
mesh.SetVertex(15, new Vertex3D(new Vector3(1, -1, -1) * size, Vector3.Right, new Vector2(0, 1), color));
mesh.SetVertex(16, new Vertex3D(new Vector3(-1, -1, 1) * size, Vector3.Down, new Vector2(0, 0), color));
mesh.SetVertex(17, new Vertex3D(new Vector3(-1, -1, -1) * size, Vector3.Down, new Vector2(1, 0), color));
mesh.SetVertex(18, new Vertex3D(new Vector3(1, -1, -1) * size, Vector3.Down, new Vector2(1, 1), color));
mesh.SetVertex(19, new Vertex3D(new Vector3(1, -1, 1) * size, Vector3.Down, new Vector2(0, 1), color));
mesh.SetVertex(20, new Vertex3D(new Vector3(-1, 1, 1) * size, Vector3.Up, new Vector2(0, 0), color));
mesh.SetVertex(21, new Vertex3D(new Vector3(1, 1, 1) * size, Vector3.Up, new Vector2(1, 0), color));
mesh.SetVertex(22, new Vertex3D(new Vector3(1, 1, -1) * size, Vector3.Up, new Vector2(1, 1), color));
mesh.SetVertex(23, new Vertex3D(new Vector3(-1, 1, -1) * size, Vector3.Up, new Vector2(0, 1), color));
for (int i = 0, f = 0; i < 12; i += 2, f += 4)
{
mesh.SetTriangle(i, f, f + 1, f + 2);
mesh.SetTriangle(i + 1, f, f + 2, f + 3);
}
//mesh.CalculateNormals();
mesh.Update();
return(mesh);
}
