I am trying to use the AssetPostProcessor to add things like collision meshes and scripts to my Maya files so that I can retain the ability to edit and modify my files while still applying and testing scripts to them. So I started very simply with this (taken from unifycommunity.com - unifycommunity Resources and Information.)
C# file:
using UnityEngine;
using UnityEditor;
using System.Collections;
public class BoundingBoxAdder : AssetPostprocessor {
void OnPostprocessModel(GameObject g)
{
// filter out only animations.
string lowerCaseAssetPath = assetPath.ToLower();
if (lowerCaseAssetPath.IndexOf("/environment/") == -1) //do this ONLY if we are in the ENVIRONMENT FOLDER, assets/environment/...
return;
Apply(g.transform);
}
// Add a mesh collider to each game object that contains collider in its name
void Apply (Transform transform){
if (transform.name.ToLower().Contains("collider")){
transform.gameObject.AddComponent(typeof(MeshCollider));
Object[] smr = transform.gameObject.GetComponentsInChildren(typeof(MeshRenderer), false);
Object[] mfs = transform.gameObject.GetComponentsInChildren(typeof(MeshFilter), false);
foreach (MeshRenderer o in smr){
Object.DestroyImmediate(o, true);
}
foreach (MeshFilter mf in mfs){
Object.DestroyImmediate(mf, true);
}
}
// Recurse
foreach(Transform child in transform)
Apply(child);
}
}
generally the error tells you how, given its casteable at all.
In your case it though isn’t as I realized on the second look.
Your problem is what caused the first error: you assign it to an incorrect array. The return is Component[ ] not Object[ ]so you should not assign it to Object[ ]
Once thats fixed the rest should commonly work again I think
That Helped Alot, Thanks! So here is what I ended up with. I added loads of comments to help others understand what I did and why. I hope someone can find use for it.
//ZergCow 2010
//Create a C# script and place it in your assets/Editor folder then copy and past this code into that file.
using UnityEngine;
using UnityEditor;
using System.Collections;
public class BoundingBoxAdder : AssetPostprocessor {
void OnPostprocessModel (GameObject g)
{
//Set the file path variable for our models
string lowerCaseAssetPath = assetPath.ToLower();
//Apply this script ONLY if we are in our folder
if (lowerCaseAssetPath.IndexOf("/ertc/models/final/") == -1) //type your file location with all your models here in lowercase
return;
//Now lets go to our Apply function to do things to our models
Apply(g.transform);
}
void Apply (Transform transform)
{
//lets look for objects with the name "collider" in it.
if (transform.name.ToLower().Contains("collider"))
{
//Apply a collision to the object that we just looked for (collider)
transform.gameObject.AddComponent(typeof(MeshCollider));
//Now look for our MeshRenderer component in the object that we looked for (collider)
//Then cast to an array
Component[] smr = transform.gameObject.GetComponentsInChildren(typeof(MeshRenderer), false);
//Now look for our MeshFilter component in the object that we looked for (collider)
//Then cast to an array
Component[] mfs = transform.gameObject.GetComponentsInChildren(typeof(MeshFilter), false);
//delete each MeshRenderer component in our object
//MeshRenderer determins how the mesh is rendered on screen.
//We dont want to render the collision object so we delete this.
foreach (MeshRenderer o in smr)
{
Object.DestroyImmediate(o, true);
}
//delete each MeshFilter component in our object
//MeshFilter determins how the mesh is rendered on screen.
//We dont want to render the collision object so we delete this.
foreach (MeshFilter mf in mfs)
{
Object.DestroyImmediate(mf, true);
}
}
//lets look for objects with the name "Valve" in it.
if (transform.name.ToLower().Contains("valve"))
{
//Apply a collision to the object that we just looked for (valve)
transform.gameObject.AddComponent(typeof(MeshCollider));
//Add a script to the object that we just looked for (valve)
transform.gameObject.AddComponent("ValveMove"); //Our script in this case is in a random folder and the script is named ValveMove
}
//Recurse
//This is so that the Apply function will execute on every peice of the model.
foreach(Transform child in transform)
Apply(child);
}
}
There’s an OnPostprocessAllAssets function which is called after all assets have been imported. The function is passed a list of asset pathnames which have changed during the import process. You could cycle through this list, note items with the right name and then combine their meshes.
