/// <summary>
/// Generates a ring of vertices using circular UV mapping, where the center of the ring is the center of the UV area.
/// This would be used to generate a partial ring, such as the procedural decoupler
/// Input radius is the radius of the actual ring, uvRadius is the radius to be used for maximal UV bounds
/// (e.g. they will only be different on an inner-ring; where radius=ring radius, and uvRadius = outerRingRadius)
/// </summary>
/// <param name="offset"></param>
/// <param name="faces"></param>
/// <param name="radius"></param>
/// <param name="height"></param>
/// <param name="startAngle"></param>
/// <param name="endAngle"></param>
/// <param name="area">The UV area to map the UV vertex to.</param>
/// <param name="uvRadius">The radius to be used for the UV area, in case it differs from the radius in use (basically scales the UV area)</param>
/// <param name="yCos">Determines the x/z normal component</param>
/// <param name="ySin">Used directly as the y normal component</param>
/// <returns></returns>
public List <Vertex> generateRadialVerticesCylinderUVs(Vector3 offset, int faces, float radius, float height, float startAngle, float endAngle, UVArea area, float uvRadius, float yCos, float ySin)
{
List <Vertex> verts = new List <Vertex>();
float startRad = startAngle * Mathf.Deg2Rad;
float endRad = endAngle * Mathf.Deg2Rad;
float totalRad = endRad - startRad;
float radPerFace = (2f * Mathf.PI) / faces;
//int numOfFaces = (int)(totalRad / radPerFace);
int numOfFaces = (int)Math.Round(totalRad / radPerFace, 0);
float rads, xCos, zSin, nx, nz, x, y, z;
Vector2 min = new Vector2(-uvRadius, -uvRadius);
Vector2 max = new Vector2(uvRadius, uvRadius);
Vector2 pos;
Vector2 uv;
//unchanging vars
y = height + offset.y;
for (int i = 0; i < numOfFaces + 1; i++)
{
rads = startRad + (radPerFace * i);
xCos = Mathf.Cos(rads);
zSin = Mathf.Sin(rads);
x = xCos * radius + offset.x;
z = zSin * radius + offset.z;
nx = xCos * yCos;
nz = zSin * yCos;
pos = new Vector2(xCos * radius, zSin * radius);
uv = area.getUV(min, max, pos);
verts.Add(addVertex(new Vector3(x, y, z), new Vector3(nx, ySin, nz), uv));
}
return(verts);
}
public void generateCylinderCap(Vector3 offset, int faces, float outerRadius, float innerRadius, float height, float startAngle, float endAngle, UVArea area, bool bottomCap)
{
float ySin = bottomCap ? -1 : 1;
List <Vertex> outerVerts = generateRadialVerticesCylinderUVs(offset, faces, outerRadius, height, startAngle, endAngle, area, outerRadius, 0, ySin);
if (innerRadius > 0)//partial cap
{
List <Vertex> innerVerts = generateRadialVerticesCylinderUVs(offset, faces, innerRadius, height, startAngle, endAngle, area, outerRadius, 0, ySin);
generateQuads(outerVerts, innerVerts, bottomCap);
}
else
{
Vector2 min = new Vector2(-outerRadius, -outerRadius);
Vector2 max = new Vector2(outerRadius, outerRadius);
Vector2 centerUV = area.getUV(min, max, new Vector2(0, 0));
Vertex center = addVertex(offset + new Vector3(0, height, 0), bottomCap ? Vector3.down : Vector3.up, centerUV);
generateTriangleFan(outerVerts, center, bottomCap);
}
}
