public static Mesh3D CreateCone(float radius, float height, int numSegments)
{
float lastx = 0;
float lastz = 0;
numSegments *= 2;
if ((numSegments % 2) == 0)
{
numSegments++;
}
var mesh = new Mesh3D();
mesh.AddVertex(new Vertex3D(new Vector3(0f, height / -2f, 0f), new Vector3(0f, -1f, 0f), new Vector2(0.5f, 0.5f)));
for (int i = 0; i < numSegments; i++)
{
float pos = (Calc.Tau / (numSegments - 1)) * i;
float x = Calc.Sin(pos);
float z = Calc.Cos(pos);
if ((i % 2) == 0)
{
mesh.AddVertex(new Vertex3D(new Vector3(x * radius, height / -2f, z * radius), new Vector3(x, 0f, z), new Vector2(0.5f + z * 0.5f, 0.5f + x * 0.5f)));
mesh.AddVertex(new Vertex3D(new Vector3(x * radius, height / -2f, z * radius), new Vector3(0f, -1f, 0f), new Vector2(0.5f + z * 0.5f, 0.5f + x * 0.5f)));
}
else
{
mesh.AddVertex(new Vertex3D(new Vector3(0f, height - height / 2f, 0f), new Vector3(0f, 1f, 0f), new Vector2(0.5f, 0.5f)));
}
lastx = x;
lastz = z;
}
int vo = 4;
for (int i = 1; i <= (numSegments - 1) / 2; i++)
{
mesh.AddIndices(vo, vo - 1, vo - 3);
mesh.AddIndices(vo + 1, vo - 2, 0);
vo += 3;
}
mesh.Update();
return(mesh);
}
public static Mesh3D CreateCylinder(float radius, float height, int segments, bool capped)
{
float lastx = 0f;
float lastz = 0f;
float lastv = 0f;
++segments;
var mesh = new Mesh3D();
if (capped)
{
mesh.AddVertex(new Vertex3D(new Vector3(0, 0 - (height / 2.0f), 0), new Vector3(0f, -1f, 0f), new Vector2(0.5f, 0.5f)));
mesh.AddVertex(new Vertex3D(new Vector3(0, height - (height / 2.0f), 0), new Vector3(0f, 1f, 0f), new Vector2(0.5f, 0.5f)));
}
for (int i = 0; i < segments; i++)
{
float v = i / (float)(segments - 1);
float pos = (Calc.Tau / (segments - 1)) * i;
float x = Calc.Sin(pos);
float z = Calc.Cos(pos);
mesh.AddVertex(new Vertex3D(new Vector3(x * radius, 0 - (height / 2.0f), z * radius), new Vector3(x, 0f, z), new Vector2(v, 0f)));
mesh.AddVertex(new Vertex3D(new Vector3(x * radius, height - (height / 2.0f), z * radius), new Vector3(x, 0f, z), new Vector2(v, 1f)));
if (capped)
{
mesh.AddVertex(new Vertex3D(new Vector3(x * radius, 0 - (height / 2.0f), z * radius), new Vector3(0f, -1f, 0f), new Vector2((0.5f + z * 0.5f), (0.5f + x * 0.5f))));
mesh.AddVertex(new Vertex3D(new Vector3(x * radius, height - (height / 2.0f), z * radius), new Vector3(0f, 1f, 0f), new Vector2((0.5f + z * 0.5f), (0.5f + x * 0.5f))));
}
lastx = x;
lastz = z;
lastv = v;
}
int vo = 2;
int vi = 1;
if (capped)
{
vi = 3;
vo = 6;
}
for (int i = 1; i <= segments - 1; i++)
{
mesh.AddIndices(vo, vo - vi, vo - vi - 1);
mesh.AddIndices(vo, vo + 1, vo - vi);
vo += 2;
if (capped)
{
mesh.AddIndices(vo, vo - vi - 1, 0);
mesh.AddIndices(1, vo - vi, vo + 1);
vo += 2;
}
}
mesh.Update();
return(mesh);
}
