koobas.hobune.stream
Update LineRenderer every frame (Delete Old Lines)
Hello,
I am trying to write a script to draw a line from a point to the position of a touch to the screen. I have been able to do this, but I cannot figure out how to make the lines from the previous frames disappear. Any help as to how to go about doing this would be greatly appreciated! My current code is below. Thank you!
void Update () {
if (Input.GetMouseButton (0)) {
drawToMouse (Vector3.zero); //as a test, drawing from center to mouse
}
}
//Draw a line from start to touched position
private void drawToMouse(Vector3 start) {
LineRenderer line = Instantiate (linePrototype) as LineRenderer;
Vector3 pointB = inputCamera.ScreenToWorldPoint (Input.mousePosition);
start = inputCamera.ScreenToWorldPoint (start);
line.SetVertexCount (2);
line.SetPosition (0, start);
line.SetPosition (1, pointB);
}
Best Answer
LineRenderer line;
void Update () {
if (Input.GetMouseButton (0)) {
drawToMouse (Vector3.zero); //as a test, drawing from center to mouse
}
}
//Draw a line from start to touched position
private void drawToMouse(Vector3 start) {
if(line) Destroy(line);
line = Instantiate (linePrototype) as LineRenderer;
Vector3 pointB = inputCamera.ScreenToWorldPoint (Input.mousePosition);
start = inputCamera.ScreenToWorldPoint (start);
line.SetVertexCount (2);
line.SetPosition (0, start);
line.SetPosition (1, pointB);
}
But the point is... You shouldn't destroy your LineRenderer and recreate one in every frame. You should create your LineRenderer in the beginning, and in every frame only change the vertex positions
Thank you for your suggestion. For some reason it was not working properly when I first had tried to just update the vertex. Got it working now. :)
