public static Model Plane(float width, float height, MeshMaterial material, OpenToolkit.Mathematics.Matrix4 state = default, RenderFlags renderFlags = RenderFlags.Solid)
{
var vertices = new MeshVertex[]
{
new MeshVertex {
Position = new Vector3(-width, 0.0f, -height), Normal = Vector3.UnitY
},
new MeshVertex {
Position = new Vector3(width, 0.0f, -height), Normal = Vector3.UnitY
},
new MeshVertex {
Position = new Vector3(-width, 0.0f, height), Normal = Vector3.UnitY
},
new MeshVertex {
Position = new Vector3(width, 0.0f, height), Normal = Vector3.UnitY
}
};
var indices = new uint[]
{
0, 1, 2, 1, 2, 3
};
return(new Model(vertices, indices, material, state, renderFlags: renderFlags));
}
public Model CreateModel(Vector3 origin, Vector3 direction, Vector4 color)
{
// TODO: create Align method for matrices, the same as for quaternions
Matrix4 align = Matrix4.CreateTranslation(origin);
if (direction != Vector3.UnitY)
{
align *= Matrix4.CreateFromAxisAngle(Vector3.Cross(Vector3.UnitY, direction), (float)Math.Acos(Vector3.Dot(Vector3.UnitY, direction)));
}
return(new Model(new Mesh[]
{
Primitives.Cylinder(0.01f, 0, 1f, 20, new MeshMaterial
{
Diffuse = color
}),
Primitives.Cone(0.05f, 0.2f, 20, new MeshMaterial
{
Diffuse = color
}, Vector3.UnitY)
}, align * Matrix4.CreateScale(_scale)));
}
public static Model Grid(int lines, float stride, MeshMaterial material, OpenToolkit.Mathematics.Matrix4 state = default, RenderFlags renderFlags = RenderFlags.Solid)
{
float lineLengthHalf = (lines - 1) * stride / 2;
var vertices = new List <MeshVertex>();
for (int i = 0; i < lines; i++)
{
var current = -lineLengthHalf + i * stride;
// Z parallel lines
vertices.Add(new MeshVertex {
Position = new Vector3(current, 0, -lineLengthHalf), Normal = Vector3.UnitY
});
vertices.Add(new MeshVertex {
Position = new Vector3(current, 0, lineLengthHalf), Normal = Vector3.UnitY
});
// X parallel lines
vertices.Add(new MeshVertex {
Position = new Vector3(-lineLengthHalf, 0, current), Normal = Vector3.UnitY
});
vertices.Add(new MeshVertex {
Position = new Vector3(lineLengthHalf, 0, current), Normal = Vector3.UnitY
});
}
var indices = new uint[vertices.Count];
for (uint i = 0; i < indices.Length; i++)
{
indices[i] = i;
}
return(new Model(vertices.ToArray(), indices, material, state, renderFlags: renderFlags));
}
public static Model Cube(float halfX, float halfY, float halfZ, MeshMaterial material, OpenToolkit.Mathematics.Matrix4 state = default, RenderFlags renderFlags = RenderFlags.Solid)
{
var vertices = new List <MeshVertex>();
float x, y, z;
foreach (var sign in new int[] { -1, 1 })
{
// X ortho faces
x = sign * halfX;
vertices.Add(new MeshVertex {
Position = new Vector3(x, halfY, halfZ), Normal = new Vector3(sign, 0.0f, 0.0f)
});
vertices.Add(new MeshVertex {
Position = new Vector3(x, halfY, -halfZ), Normal = new Vector3(sign, 0.0f, 0.0f)
});
vertices.Add(new MeshVertex {
Position = new Vector3(x, -halfY, halfZ), Normal = new Vector3(sign, 0.0f, 0.0f)
});
vertices.Add(new MeshVertex {
Position = new Vector3(x, -halfY, -halfZ), Normal = new Vector3(sign, 0.0f, 0.0f)
});
// Y ortho faces
y = sign * halfY;
vertices.Add(new MeshVertex {
Position = new Vector3(halfX, y, halfZ), Normal = new Vector3(0.0f, sign, 0.0f)
});
vertices.Add(new MeshVertex {
Position = new Vector3(halfX, y, -halfZ), Normal = new Vector3(0.0f, sign, 0.0f)
});
vertices.Add(new MeshVertex {
Position = new Vector3(-halfX, y, halfZ), Normal = new Vector3(0.0f, sign, 0.0f)
});
vertices.Add(new MeshVertex {
Position = new Vector3(-halfX, y, -halfZ), Normal = new Vector3(0.0f, sign, 0.0f)
});
// Z ortho faces
z = sign * halfZ;
vertices.Add(new MeshVertex {
Position = new Vector3(halfX, halfY, z), Normal = new Vector3(0.0f, 0.0f, sign)
});
vertices.Add(new MeshVertex {
Position = new Vector3(halfX, -halfY, z), Normal = new Vector3(0.0f, 0.0f, sign)
});
vertices.Add(new MeshVertex {
Position = new Vector3(-halfX, halfY, z), Normal = new Vector3(0.0f, 0.0f, sign)
});
vertices.Add(new MeshVertex {
Position = new Vector3(-halfX, -halfY, z), Normal = new Vector3(0.0f, 0.0f, sign)
});
}
var indices = new List <uint>();
uint k;
for (uint i = 0; i < 6; i++)
{
k = 4 * i;
// lower triangle
indices.Add(k);
indices.Add(k + 1);
indices.Add(k + 2);
// upper triangle
indices.Add(k + 1);
indices.Add(k + 2);
indices.Add(k + 3);
}
return(new Model(vertices.ToArray(), indices.ToArray(), material, state, renderFlags: renderFlags));
}
public static Mesh Cylinder(float radius, float extentDown, float extentUp, int circleCount, MeshMaterial material, OpenToolkit.Mathematics.Matrix4 state = default, RenderFlags renderFlags = RenderFlags.Solid)
{
float radiusInv = 1.0f / radius;
float angleStep = 2 * (float)Math.PI / circleCount;
// the order of the vertices:
// [L, U, LC1, UC1, LS1, US1, LC2, UC2, LS2, US2, ...],
// where
// L - central point of the lower circle,
// U - central point of the upper circle,
// LCi - i-th point of the lower circle with central normal,
// UCi - i-th point of the upper circle with central normal,
// LSi - i-th point of the lower circle with side normal,
// USi - i-th point of the upper circle with side normal
var vertices = new List <MeshVertex>
{
// add L and U
new MeshVertex {
Position = new Vector3(0, -extentDown, 0), Normal = -Vector3.UnitY
},
new MeshVertex {
Position = new Vector3(0, extentUp, 0), Normal = Vector3.UnitY
}
};
float angle, cos, sin;
for (int i = 0; i <= circleCount; i++)
{
angle = i * angleStep;
cos = radius * (float)Math.Cos(angle);
sin = radius * (float)Math.Sin(angle);
// add LCi and UCi
vertices.Add(new MeshVertex {
Position = new Vector3(cos, -extentDown, sin), Normal = -Vector3.UnitY
});
vertices.Add(new MeshVertex {
Position = new Vector3(cos, extentUp, sin), Normal = Vector3.UnitY
});
// add LSi and USi
vertices.Add(new MeshVertex {
Position = new Vector3(cos, -extentDown, sin), Normal = new Vector3(cos * radiusInv, 0, sin * radiusInv)
});
vertices.Add(new MeshVertex {
Position = new Vector3(cos, extentUp, sin), Normal = new Vector3(cos * radiusInv, 0, sin * radiusInv)
});
}
var indices = new List <uint>();
// lower circle faces
for (uint i = 0; i < circleCount; i++)
{
indices.Add(0);
indices.Add(4 * i + 2);
indices.Add(4 * i + 6);
}
// upper circle faces
for (uint i = 0; i < circleCount; i++)
{
indices.Add(1);
indices.Add(4 * i + 3);
indices.Add(4 * i + 7);
}
// side faces
for (uint i = 0; i < circleCount; i++)
{
// lower triangle
indices.Add(4 * i + 4);
indices.Add(4 * i + 5);
indices.Add(4 * i + 8);
// upper triangle
indices.Add(4 * i + 5);
indices.Add(4 * i + 8);
indices.Add(4 * i + 9);
}
//return new Model(vertices.ToArray(), indices.ToArray(), material, state, renderFlags: renderFlags);
return(new Mesh("Cylinder", vertices.ToArray(), indices.ToArray(), new MeshTexture[0], material));
}
public static Model Sphere(float radius, uint stackCount, uint sectorCount, MeshMaterial material, OpenToolkit.Mathematics.Matrix4 state = default, RenderFlags renderFlags = RenderFlags.Solid)
{
float radiusInv = 1.0f / radius;
float pi2 = (float)Math.PI / 2;
var vertices = new List <MeshVertex>();
float x, y, z, xy; // positions
float nx, ny, nz; // normals
//float s, t; //textures
float stackStep = (float)Math.PI / stackCount;
float sectorStep = 2 * (float)Math.PI / sectorCount;
float stackAngle, sectorAngle;
for (int i = 0; i <= stackCount; i++)
{
stackAngle = pi2 - i * stackStep;
xy = radius * (float)Math.Cos(stackAngle);
z = radius * (float)Math.Sin(stackAngle);
for (int j = 0; j <= sectorCount; j++)
{
sectorAngle = j * sectorStep;
// positions
x = xy * (float)Math.Cos(sectorAngle);
y = xy * (float)Math.Sin(sectorAngle);
// normals
nx = x * radiusInv;
ny = y * radiusInv;
nz = z * radiusInv;
// textures
//s = (float)j / sectorCount;
//t = (float)i / stackCount;
vertices.Add(new MeshVertex
{
Position = new Vector3(x, y, z),
Normal = new Vector3(nx, ny, nz)
});
}
}
var indices = new List <uint>();
uint k1, k2;
for (uint i = 0; i < stackCount; i++)
{
k1 = i * (sectorCount + 1);
k2 = k1 + sectorCount + 1;
for (int j = 0; j < sectorCount; j++, k1++, k2++)
{
if (i != 0)
{
indices.Add(k1);
indices.Add(k2);
indices.Add(k1 + 1);
}
if (i != stackCount - 1)
{
indices.Add(k1 + 1);
indices.Add(k2);
indices.Add(k2 + 1);
}
}
}
// return a model
return(new Model(vertices.ToArray(), indices.ToArray(), material, state, renderFlags: renderFlags));
}
