Combine Children Dictionary in place of Hashtable?

Question

Hi,

       In Combine Children script how to convert the hashtable to Dictionary.

and ArrayList to List? ? ?

Here is coding part of Combine children. .

 void Awake()
 {
 Hashtable materialToMesh = new Hashtable();
 
 ArrayList objects = (ArrayList)materialToMesh[materials[m]];
 if (objects != null) 
 {                        objects.Add(instance);
 }
 else
 {
 objects.Add(instance);
 materialToMesh.Add(materials[m], objects);objects = new ArrayList();
 }

If i changed the Hashtable and ArrayList like this Dictionary materialToMesh= new Dictionary(); List objects = (List)materialToMesh[materials[m]];

It shows and Error. .

Help me to solve this? ?

Answer 1

Answer by iwaldrop · Jan 16, 2013 at 11:16 PM

It's because you have to tell the compiler what types of data the Dictionary is going to hold:

 Dictionary<byte, object> op = new Dictionary<byte, object>();

Additionally, in order to create Lists you need to do the following:

 List<float> floats = new List<float>();

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SARWAN · Jan 17, 2013 at 05:01 AM 0

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Yes. I did that, but still facing the error .

Dictionary materialToMesh= new Dictionary(); MeshCombineUtility.MeshInstance instance = new MeshCombineUtility.MeshInstance (); List objects = (List)materialToMesh[materials[m]];

Error it shows is: Error 114 Cannot convert type 'UnityEngine.Mesh' to 'System.Collections.Generic.List'

iwaldrop · Jan 17, 2013 at 05:59 AM 0

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Well, the error says it all; you're attempting to cast the Value of materials[m] as a List (which appears to be a Mesh by looking the error).

If you're trying to take all the Values of a Dictionary and put them into a List then you need to do something like the following:

 List<Mesh> meshes = new List<Mesh>();
 materialToMesh.Values.ForEach(m => meshes.Add(m));

SARWAN · Jan 17, 2013 at 06:09 AM 0

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https://www.assembla.com/code/bolaDePano/subversion/nodes/Assets/Standard%20Assets/Scripts/CombineChildren.cs

Here is the Link of the Script that i got error in the conversion. Look out it.

iwaldrop · Jan 17, 2013 at 07:04 AM 1

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Neat script. Sorry, but this is a little above my pay grade. I hope that someone else can give you an answer. I've bumped it so maybe somebody will take notice. Good luck!

SARWAN · Jan 17, 2013 at 10:43 AM 0

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Thanks for your reply

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Answer 2

Answer by SARWAN · Jan 17, 2013 at 06:42 AM

@iwaldrop
Yes I Already did the same thing only. But i didn't put in the code part so only it shows like that. I changed that to

 Dictionary<Material,Mesh> materialToMesh= new Dictionary<Material,Mesh>();    
 for (int i=0;i<filters.Length;i++) {
 ..
 ..
 MeshCombineUtility.MeshInstance instance = new MeshCombineUtility.MeshInstance ();
 ...
 ...
 ...
 Material[] materials = curRenderer.sharedMaterials;
                 for (int m=0;m<materials.Length;m++) {
                     instance.subMeshIndex = System.Math.Min(m, instance.mesh.subMeshCount - 1);
                     List<MeshCombineUtility.MeshInstance> objects = (List<MeshCombineUtility.MeshInstance>)materialToMesh[materials[m]];

But it shows an error as Error 114 Cannot convert type 'UnityEngine.Mesh' to 'System.Collections.Generic.List'

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Combine Children Dictionary in place of Hashtable?

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