private void GenerateLeaf(Vector3 position, Quaternion orientation, float leafGrowth)
{
Quaternion leafOrientation = orientation * Quaternion.Euler(-Species.LeafVerticalAngle, 0, 0);
float leafScale = Mathf.Pow(leafGrowth, Species.ScaleExponent);
// generate petiole
int startVC = mg.VertexCount;
mg.SetMaterial(0);
List <int> petioleRing = tempIndices.GetNext();
petioleRing.Clear();
petioleRing.Add(mg.AddVertex(Vector3.left * Species.PetioleWidth * 0.5f));
petioleRing.Add(mg.AddVertex(Vector3.right * Species.PetioleWidth * 0.5f));
petioleRing.Add(mg.AddVertex(Vector3.down * Species.PetioleDepth));
int petioleEndPoint = mg.AddVertex(new Vector3(0, 0, Species.PetioleLength));
for (int i = 0; i < 3; i++)
{
int j = (i + 1) % 3;
mg.AddFace(petioleEndPoint, petioleRing[j], petioleRing[i]);
}
// generate blade
int bladeStartVC = mg.VertexCount;
mg.SetMaterial(1);
// blade front faces
float bladeX = Mathf.Cos(Species.BladeFoldAngle * Mathf.Deg2Rad) * Species.BladeWidth * 0.5f;
float bladeY = Mathf.Sin(Species.BladeFoldAngle * Mathf.Deg2Rad) * Species.BladeWidth * 0.5f;
Vector3 bladeLeftPos = new Vector3(-bladeX, bladeY, Species.BladeLength * 0.5f);
Vector3 bladeRightPos = new Vector3(bladeX, bladeY, Species.BladeLength * 0.5f);
Vector3 bladeTipPos = new Vector3(0, 0, Species.BladeLength);
int bladeBase = mg.AddVertex(Vector3.zero);
int bladeTip = mg.AddVertex(bladeTipPos);
int bladeLeft = mg.AddVertex(bladeLeftPos);
int bladeRight = mg.AddVertex(bladeRightPos);
mg.AddFace(bladeBase, bladeTip, bladeRight);
mg.AddFace(bladeBase, bladeLeft, bladeTip);
// blade back faces
bladeBase = mg.AddVertex(Vector3.zero);
bladeTip = mg.AddVertex(bladeTipPos);
bladeLeft = mg.AddVertex(bladeLeftPos);
bladeRight = mg.AddVertex(bladeRightPos);
mg.AddFace(bladeBase, bladeRight, bladeTip);
mg.AddFace(bladeBase, bladeTip, bladeLeft);
// orient and position leaf
int endVC = mg.VertexCount;
mg.TranslateVertices(bladeStartVC, endVC, new Vector3(0, 0, Species.PetioleLength * Species.BladePosition));
mg.ScaleVertices(startVC, endVC, leafScale);
mg.RotateVertices(startVC, endVC, leafOrientation);
mg.TranslateVertices(startVC, endVC, position);
}