private bool PlaceObjects()
{
if (Event.current.type != EventType.KeyDown)
{
return(false);
}
Event.current.Use();
if (_lastHitTangentSpace == null)
{
// No location to place something.
// But it's handled.
return(true);
}
if (Event.current.keyCode != KeyCode.Space)
{
// Currently only space is used, ignore the reset...
// But it's handled.
return(true);
}
foreach (PlacementLocation location in RandomLocations.Where(rl => rl.HitSurface))
{
// Skip when normal too much off.
float angle = Vector3.Angle(_lastHitTangentSpace.Up, location.Normal);
float thresholdAngle = 45;
if (angle > thresholdAngle)
{
// TOO Steep
continue;
}
GameObject prefab = GetPrefab();
Undo.RegisterCreatedObjectUndo(prefab, "Spawn Objects");
prefab.name += $" ∠{angle}";
prefab.transform.position = location.WorldPosition;
prefab.transform.rotation = location.Rotation;
if (Container)
{
prefab.transform.SetParent(Container.transform, true);
}
}
GenerateRandomLocations(SpawnCount, true);
return(true);
}
private void UpdateSceneUI()
{
if (Event.current.type != EventType.Repaint || _lastHitTangentSpace == null)
{
return;
}
Handles.zTest = CompareFunction.LessEqual;
// Draw the current situation.
_lastHitTangentSpace.DrawHandles();
// The tangent plane.
// Handles.color = new Color(0, 0, 0, .5f);
// Handles.DrawSolidDisc(hit.point + hit.normal * .01f, hit.normal, Radius);
// The ray plane.
// Handles.color = new Color(0, 0, 0, .5f);
// Handles.DrawSolidDisc(hit.point + _rayElevationHeight * hit.normal, hit.normal, Radius);
DrawBrush(Color.blue, 6f, 256);
foreach (PlacementLocation location in RandomLocations.Where(rl => rl.HitSurface))
{
// Skip when normal too much off.
float angle = Vector3.Angle(_lastHitTangentSpace.Up, location.Normal);
float thresholdAngle = 30;
GameObject activePrefab = GetActivePrefab(location.PrefabIndex);
if (activePrefab == null)
{
Color handleColor = GetAngleColor(angle, thresholdAngle);
// Draw a dot where a placement will occur.
Handles.color = handleColor;
Handles.SphereHandleCap(-1, location.WorldPosition, Quaternion.identity, .1f, EventType.Repaint);
// Draw the local normal
Handles.color = Color.black;
Handles.DrawAAPolyLine(5f, location.WorldPosition, location.WorldPosition + location.Normal);
}
else
{
if (angle > thresholdAngle)
{
continue;
}
RenderModelAtLocation(activePrefab, location);
}
}
}
private void UpdatePlacementLocations()
{
foreach (PlacementLocation location in RandomLocations.ToArray())
{
// Scale the point in the unit-circle to a circle of specified radius.
Vector2 localPoint = location.UnitLocation * Radius;
Ray placementRay = _lastHitTangentSpace.GetTangentRay(localPoint, _rayElevationHeight);
bool validSurface = false;
bool hitSurface = Physics.Raycast(placementRay, out RaycastHit placementHit);
if (hitSurface)
{
GameObject surfaceObject = placementHit.transform.gameObject;
int surfaceLayer = surfaceObject.layer;
int surfaceMask = 1 << surfaceLayer;
validSurface = (SurfaceLayers.value & surfaceMask) == surfaceMask;
}
if (validSurface)
{
// Align the object with the Normal vector of the local plane.
Quaternion rotation = Quaternion.FromToRotation(Vector3.up, location.Normal);
// Give it a random rotation around the Normal vector.
rotation *= location.Orientation; // Quaternion.Euler(0, Random.value * 360, 0);
location.HitSurface = true;
location.WorldPosition = placementHit.point;
location.Normal = placementHit.normal;
location.Rotation = rotation;
}
else
{
location.HitSurface = false;
#if DEBUG
location.WorldPosition = Vector3.zero;
location.Normal = Vector3.zero;
#endif
}
}
}
