koobas.hobune.stream
Assigning new Mesh Vertices
Hi Unity Community
I having issues with some code where I am trying to assign new values from Vector3 array to that of the vertices in the object's mesh.
For my needs I could just delete the existing object in scene and create a new one but that isn't really solving the issue of my logic so could anyone please provide me some pointers as to where I am going wrong?
Many thanks in advance, Ryan
function ExpVertText(userText : String)
{
var textArray = userText.Substring (1, userText.Length-2).Split ([")("], System.StringSplitOptions.RemoveEmptyEntries);
var vectArray = new Vector3[textArray.Length];
for (var i = 0; i < textArray.Length; i++) {
var numbers = textArray[i].Split(","[0]);
vectArray[i] = Vector3(parseFloat(numbers[0]), parseFloat(numbers[1]), parseFloat(numbers[2]));
}
Debug.Log("Mesh Stored");
var curObj = GameObject.Find("TestObject"); //current object
var curVertArray = curObj.GetComponent(MeshFilter).mesh.vertices;
for (var j = 0; j < vectArray.Length; j++) {
Debug.Log("Old vert: " + curVertArray[j]);
curVertArray[j] = vectArray[j];
Debug.Log("New vert: " + curVertArray[j]);
}
Debug.Log("Mesh Updated");
return curObj;
}
Mesh.vertices returns a copy of the vertex positions or assigns a new vertex positions array. http://docs.unity3d.com/ScriptReference/Mesh-vertices.html
When you assign the vertices to curVertArray you are assigning them to a copy of Mesh.vertices. You need to assign curVertArray back to Mesh.vertices after you are done editing it, i.e. add the following line at line 20
curObj.GetComponent(MeshFilter).mesh.vertices=curVertArray;
you are a legend; this was my very problem, thank you very much!
Try the examples provided here:
http://docs.unity3d.com/ScriptReference/Mesh.html
I believe the documentation is correct.
Hi @Graham Dunnett
Thank you very much for your prompt reply! Yes the mesh reference is great, I used it frequently to get to my current point.
The issue I'm encountering is that I need to iterate through the arrays for the length of the shorter Vector3[] array (derived from text based information) and replace some of the mesh.vertice array with its contents.
The docs suggest to clear the mesh before assigning new vert values however, I only wish to partially change the existing mesh, so calling Clear() does't seem like an option. I assumed that by iterating for the length of the short array and assigning the new vertices values would achieve this, however I can't seem to save these to the .mesh object.
It seems to work when declared as newVectArray = oldVectArray which would replace the whole array, however I can't get this to work when iterated through as newVectArray[i] = oldVectArray[i]. Can you please shed some light as to why this is the case?
Thank you very much in advance, Ryan
