public Transform CreateNewGeometryAt(float startX)
{
GameObject holder = new GameObject("Terrain_" + startX);
holder.transform.parent = this.transform;
for (int i = 0; i < SEGMENTS_PER_GROUP; i++)
{
// Calculating the start and end points is pretty easy using Unity's built in perlin noise:
float x = startX + i * lengthPerSegment;
Vector3 startPoint = new Vector2(x, GetY(x));
Vector3 endPoint = new Vector2(x + lengthPerSegment, GetY(x + lengthPerSegment));
// We can draw a line pretty simply to see our terrain:
Debug.DrawLine(startPoint, endPoint, i % 2 == 1 ? Color.blue : Color.red, 10f);
// But we want to rotate and resize default Unity cubes to match these endpoints, so we need some math...
// Segment length is used as the scale.
Vector3 delta = endPoint - startPoint;
float segmentLength = delta.magnitude;
// find the rotation:
Quaternion rot = Quaternion.FromToRotation(Vector3.right, delta);
// determine center position of segment:
Vector3 center = startPoint + delta / 2f;
GameObject segment = Instantiate(terrainChunkPrefab, center, rot) as GameObject;
segment.transform.localScale = new Vector3(segmentLength, 1f, 1f);
Chipmunk.UpdatedTransform(segment);
// That's all we need to do! If you want, you can edit the Chipmunk Shape like this:
ChipmunkSegmentShape shape = segment.GetComponent <ChipmunkSegmentShape>();
shape.friction = 1.5f;
// and anything else you might want to do with the shape...
// Parent the new object.
segment.transform.parent = holder.transform;
}
return(holder.transform);
}
public void OnSceneGUI()
{
ChipmunkSegmentShape seg = target as ChipmunkSegmentShape;
if (seg != null)
{
SetupUndo("edited ChipmunkSegmentShape");
Transform t = seg.transform;
Vector3 endPoint1 = t.TransformPoint(seg.center + seg.endPoint);
Vector3 endPoint2 = t.TransformPoint(seg.center - seg.endPoint);
Vector2 endPoint1Delta = CircleHandle(endPoint1) - (Vector2)endPoint1;
Vector2 endPoint2Delta = CircleHandle(endPoint2) - (Vector2)endPoint2;
if (endPoint1Delta != Vector2.zero || endPoint2Delta != Vector2.zero)
{
endPoint1 = endPoint1 + (Vector3)endPoint1Delta;
endPoint2 = endPoint2 + (Vector3)endPoint2Delta;
Vector2 center = Vector2.Lerp(endPoint1, endPoint2, 0.5f);
seg.center = t.InverseTransformPoint(center);
seg.endPoint = t.InverseTransformPoint(endPoint1) - t.InverseTransformPoint(center);
EditorUtility.SetDirty(target);
}
float maxScale = seg._maxScale;
float radius = seg.radius;
float radiusDelta = (
Handles.RadiusHandle(t.rotation, endPoint1, radius * maxScale, false) / maxScale +
Handles.RadiusHandle(t.rotation, endPoint2, radius * maxScale, false) / maxScale -
2f * radius
);
if (radiusDelta != 0f)
{
seg.radius += radiusDelta;
EditorUtility.SetDirty(target);
}
}
}
