void DrawNodeGizmo(TetrahedronTreeNode node)
{
if (node == null)
{
return;
}
for (int i = 0; i < 3; i++)
{
Vector3 n = node.GetFaceNormal(i);
Vector3 avg = node.GetFaceAvg(i);
Gizmos.DrawLine(avg, avg + n * 0.1f);
DrawNodeGizmo(node.children[i]);
}
for (int i = 0; i < 4; i++)
{
Vector3 v = node.vertices[i];
Gizmos.DrawSphere(v, 0.01f);
}
}
public static void GenerateTree(TetrahedronTreeNode node, int maxDepth)
{
float chance = BranchChance(node);
if (maxDepth <= 0)
{
return;
}
// for each face of this node
for (int i = 0; i < 3; i++)
{
// determine if we should branch or not
if (i == 0 || Random.value < chance)
{
// start a new branch by creating a new TetTreeNode
// get vertices of base face
Vector3[] verts = node.GetFace(i);
// determine the position of the last vertex -and the overall shape- for the new tetrahedron.
// (this to a large extend determines how the final tree will look like)
Vector3 basepos = node.GetFaceAvg(i);
Vector3 dir = BranchLength(node) * (node.dir + node.GetFaceNormal(i));
float maxDev = BranchMaxDeviation(node);
// rotate direction vector some random amount
Quaternion rot = Quaternion.Euler(Random.value * maxDev, Random.value * maxDev, Random.value * maxDev);
dir = rot * dir;
// apply upwards tendency, because we want this to look like a tree and not a shrubbery.
dir.y += BranchUpwardsStrength(node);
Vector3 d = basepos + dir;
// create the new tree node and continue generating
TetrahedronTreeNode child = new TetrahedronTreeNode(verts[2], verts[1], verts[0], d);
node.children[i] = child;
GenerateTree(child, maxDepth - 1);
}
}
}