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);
}
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 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);
}
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);
}
