koobas.hobune.stream
Drawing from origin to each vertex on an object
Hi there, I'm doing a raycast to determine which object the mouse is over. Once this is done, I want check the vertex closest to that point within the object.
To start off with, just to ensure I understand what I'm doing, once an object is clicked, I'm looping through all the vertices and drawing a line between hte objects transform and the vertex as below:
void GetandDraw ()
{
mesh = GetComponent<MeshFilter> ().mesh;
vertices = mesh.vertices;
DrawVertices ();
}
void DrawVertices ()
{
foreach (Vector3 vertex in vertices) {
// A plane is stored in x and z, so we need to make the z the y
Vector3 newVertex = new Vector3 (vertex.x, vertex.z, vertex.y);
Debug.DrawLine (transform.position, transform.position + newVertex, Color.red, 10.0f);
}
}
I dont understand the result I'm getting (the little bundle of read lines at the position of hte plane) - the 'shape' seems to be correct (the bundle of lines seem to be stretching towards each vertex), but come considerably short of reaching them. It looks as if I need to scale the vertex positions to get the result I'm after, but I don't understand why?
BTW I should add the solitary red line is the raycast.
So this now makes it work: Vector3 newVertex = new Vector3 (vertex.x transform.localScale.x, vertex.z transform.localScale.z, vertex.y);
I don't understand why I need to scale this up - surely a vertex is an absolute position?
Vertex positions are stored locally, relative to the object. You need to convert them to World Space.
foreach (Vector3 vertex in vertices) {
Vector3 vertexWorldPos = vertObject.TransformPoint(vertex);
Debug.DrawLine (transform.position, vertexWorldPos, Color.red, 10.0f);
}
I didnt read your entire post :) But im pretty sure this is what you want!
