private void UpdatePreviewBrush()
{
TerrainScript targetScript = ((TerrainScript)target);
if ((targetScript.treePrototypes.Count > 0) && (previewMesh != null))
{
previewMesh.UpdatePreviewMesh(targetScript.terrainData.treeInstances,
targetScript.treePrototypes[0].prefab.renderer.bounds.size.y);
}
Vector3 normal = Vector3.zero;
Vector3 hitPos = Vector3.zero;
Vector2 vector;
Vector3 vector2 = Vector3.zero;
float m_Size = 16 * brushSize;
Projector previewProjector = currentTextureBrush.GetPreviewProjector();
float num = 1f;
float num2 = mixMap.width / mixMap.height;
Vector2 size = targetScript.getSizeOfMesh(); // terrain.getSizeOfMesh();
int terrainSizeX = (int)size.x;
int terrainSizeZ = (int)size.y;
Transform PPtransform = previewProjector.transform;
bool flag = true;
Vector2 newMousePostion = Event.current.mousePosition;
newMousePostion.y = Screen.height - (Event.current.mousePosition.y + 35);
Ray ray = Camera.current.ScreenPointToRay(newMousePostion);
RaycastHit hit;
if (Physics.Raycast(ray, out hit, 1000f))
{
vector2 = hit.point;
hitPos = hit.point;
normal = hit.normal;
float num4 = ((m_Size % 2) != 0) ? 0.5f : 0f;
int alphamapWidth = 64;
int alphamapHeight = 64;
vector.x = (Mathf.Floor(hit.textureCoord.x * alphamapWidth) + num4) / ((float)alphamapWidth);
vector.y = (Mathf.Floor(hit.textureCoord.y * alphamapHeight) + num4) / ((float)alphamapHeight);
vector2.x = vector.x * -terrainSizeX + (terrainSizeX / 2);
vector2.z = vector.y * -terrainSizeZ + (terrainSizeZ / 2);
vector2 += Selection.activeGameObject.transform.position;
num = ((m_Size * 0.5f) / ((float)alphamapWidth)) * terrainSizeX;
num2 = ((float)alphamapWidth) / ((float)alphamapHeight);
}
else
{
flag = false;
}
previewProjector.enabled = flag;
if (flag)
{
PPtransform.position = hitPos + (normal * 100);
PPtransform.rotation = Quaternion.LookRotation(normal);
}
previewProjector.orthographicSize = num / num2;
previewProjector.aspectRatio = num2;
}