private int RandomMeshId(ShrineGenerationConfig config, bool isEnd)
{
int res = 0;
for (int i = 0; i < triangles.Length - 1; i++)
{
if (Random.value < (isEnd ? config.AccentChanceEnd : config.AccentChanceMid))
{
res++;
}
else
{
return(res);
}
}
return(res);
}
public Bounds GenerateShrine(ShrineGenerationConfig config, int seed, GameObject targetObject)
{
var oldState = Random.state;
Random.InitState(seed);
// start of setup stage
// choose symmetry before anything else so that it can be shared by other generators
int rotationalSymmetry = config.RotationalSymmetry.RandomValue();
bool bilateralSymmetry = false;
// create seeds to isolate static generation of various stages
int plinthSeed = Random.Range(int.MinValue, int.MaxValue);
int mainSeed = Random.Range(int.MinValue, int.MaxValue);
int capSeed = Random.Range(int.MinValue, int.MaxValue);
var targetMeshRenderer = targetObject.GetComponent <MeshRenderer>();
vertices = new List <Vector3>();
triangles = new List <int> [targetMeshRenderer.sharedMaterials.Length];
for (int i = 0; i < triangles.Length; i++)
{
triangles[i] = new List <int>();
}
float sectionAngle = (Mathf.PI * 2) / rotationalSymmetry;
float faceAngle = bilateralSymmetry ? sectionAngle * 0.5f : sectionAngle;
float currentAngle = 0;
float twistAngle = 0;
if (Random.value < config.GlobalTwistChance)
{
twistAngle = config.TwistAngle.RandomValue() * (Random.value > 0.5 ? 1 : -1);
}
//Debug.Log($"twistAngle {twistAngle}");
float tierRadius = 0;
float tierHeight = 0;
float topY = 0;
Vector3 lr = Vector3.zero;
Vector3 ll = Vector3.zero;
Vector3 ul = Vector3.zero;
Vector3 ur = Vector3.zero;
// end of setup stage, start of plinth stage
Random.InitState(plinthSeed);
currentMeshId = 0;
tierRadius = config.PlinthBaseRadius.RandomValue();
ul = RadialPoint(currentAngle, tierRadius, topY);
ur = RadialPoint(currentAngle + faceAngle, tierRadius, topY);
float tierRadiusFactor = config.PlinthRadiusFactor.RandomValue();
tierHeight = config.PlinthTierHeight.RandomValue();
int plinthTierCount = config.PlinthTierCount.RandomValue();
for (var pti = 0; pti < plinthTierCount; pti++)
{
// add vertical face
topY += tierHeight;
lr = ur;
ll = ul;
ul = RadialPoint(currentAngle, tierRadius, topY);
ur = RadialPoint(currentAngle + faceAngle, tierRadius, topY);
AddFace(new Vector3[] { ul, ur, lr, ll });
// add horizontal face
if (pti < plinthTierCount - 1)
{
if (twistAngle != 0)
{
// find the minimum radius with twists
float apotheum = tierRadius * Mathf.Cos(Mathf.PI / rotationalSymmetry);
float innerAngle = Mathf.PI / rotationalSymmetry - Mathf.Abs(twistAngle);
float radiusRatio = 1 / Mathf.Cos(innerAngle);
float minRadius = apotheum * radiusRatio;
tierRadius = Mathf.Min(minRadius, tierRadius * tierRadiusFactor);
currentAngle += twistAngle;
}
else
{
tierRadius *= tierRadiusFactor;
}
lr = ur;
ll = ul;
ul = RadialPoint(currentAngle, tierRadius, topY);
ur = RadialPoint(currentAngle + faceAngle, tierRadius, topY);
AddFace(new Vector3[] { ul, ur, lr, ll });
}
}
ul = RadialPoint(currentAngle, tierRadius, topY);
ur = RadialPoint(currentAngle + faceAngle, tierRadius, topY);
Vector3 plinthTopVertex = new Vector3(0, topY, 0);
AddFace(new Vector3[] { ur, ul, plinthTopVertex });
// end of plinth stage, start of main stage
Random.InitState(mainSeed);
tierRadius = config.Radius.RandomValue();
ul = RadialPoint(currentAngle, tierRadius, topY);
ur = RadialPoint(currentAngle + faceAngle, tierRadius, topY);
int tierCount = config.TierCount.RandomValue();
for (var ti = 1; ti < tierCount; ti++)
{
bool offsetTier = Random.value < config.OffsetTierChance;
tierRadius = config.Radius.RandomValue();
if (offsetTier)
{
tierHeight = config.OffsetTierHeight.RandomValue();
}
else
{
tierHeight = config.TierHeight.RandomValue();
}
topY += tierHeight;
lr = ur;
ll = ul;
currentMeshId = RandomMeshId(config, ti == tierCount);
if (offsetTier)
{
currentAngle += sectionAngle * 0.5f;
ul = RadialPoint(currentAngle, tierRadius, topY);
ur = RadialPoint(currentAngle + faceAngle, tierRadius, topY);
AddFace(new Vector3[] { lr, ul, ur });
AddFace(new Vector3[] { ul, lr, ll });
}
else
{
if (Random.value < config.SegmentTwistChance)
{
currentAngle += twistAngle;
}
ul = RadialPoint(currentAngle, tierRadius, topY);
ur = RadialPoint(currentAngle + faceAngle, tierRadius, topY);
Vector3[] facePoints = new Vector3[] { ul, ur, lr, ll };
int extrudeCount = 0;
if (Random.value < config.ExtrudeChance)
{
extrudeCount = config.ExtrudeSteps.RandomValue();
}
for (int i = 0; i < extrudeCount; i++)
{
currentMeshId = RandomMeshId(config, i == extrudeCount);
float extrudeDist = config.BranchSegmentLength.RandomValue();
Vector3 extrudeVec = Normal(facePoints);
Vector3 noiseDirection = Random.insideUnitSphere;
extrudeVec = Vector3.Lerp(extrudeVec, noiseDirection, config.BranchDirectionNoise);
extrudeVec = Vector3.Lerp(extrudeVec, Vector3.up, config.BranchVerticalBias.RandomValue());
extrudeVec *= extrudeDist;
Vector3[] newFacePoints = ExtrudePoints(facePoints, extrudeVec);
Vector3 newFaceCenter = Center(newFacePoints);
float scaleAmount = config.BranchSegmentScale.RandomValue();
newFacePoints = ScalePoints(newFacePoints, scaleAmount, newFaceCenter);
if (Random.value < config.SegmentTwistChance)
{
newFacePoints = RotatePoints(newFacePoints, twistAngle, extrudeVec, newFaceCenter);
}
AddTubeFaces(facePoints, newFacePoints);
facePoints = newFacePoints;
}
if (Random.value < config.PeakChance)
{
float peakDistance = config.BranchPeakSize.RandomValue();
AddPeak(facePoints, peakDistance);
}
else
{
AddFace(facePoints);
}
}
}
// end of main stage, start of cap stage
Random.InitState(capSeed);
float peakHeight = config.PeakSize.RandomValue();
Vector3 peakVertex = new Vector3(0, topY + peakHeight, 0);
AddFace(new Vector3[] { ur, ul, peakVertex });
// end of cap stage, all randomization should be finished
// copy mirrored / rotated segments to complete model
//if (bilateralSymmetry)
// AddMirrored();
AddRotations(sectionAngle, rotationalSymmetry);
// create final mesh
Mesh mesh = new Mesh();
for (int i = 0; i < vertices.Count; i++)
{
vertices[i] *= config.FinalScale;
}
mesh.SetVertices(vertices);
mesh.subMeshCount = triangles.Length;
for (int meshId = 0; meshId < triangles.Length; meshId++)
{
mesh.SetTriangles(triangles[meshId].ToArray(), meshId);
}
mesh.RecalculateNormals();
mesh.RecalculateTangents();
mesh.RecalculateBounds();
targetObject.GetComponent <MeshFilter>().sharedMesh = mesh;
var collider = targetObject.GetComponent <MeshCollider>();
if (collider != null)
{
collider.sharedMesh = null;
collider.sharedMesh = mesh;
}
Random.state = oldState;
return(mesh.bounds);
}
