Question by sjQrs · Mar 06, 2020 at 02:39 PM · unity 5 raycast texture2d setpixel

make pencil just like the lab

i wanna make a marker just like they have in the steam game the lab can't find any tutorials online. on how to draw during runtime.

this is what i got right now but it doesn't draw smoothly.

 public class ExampleClass : MonoBehaviour
 {
     private int Size = 2;
 
     void Update()
     {
         Vector3 markerRange = transform.TransformDirection(Vector3.forward) * 0.1f;
 
         RaycastHit hit;
         if (Physics.Raycast(transform.position, markerRange ,out hit, 0.1f))
         {
             Renderer rend = hit.transform.GetComponent<Renderer>();
             MeshCollider meshCollider = hit.collider as MeshCollider;
 
             if (rend == null || rend.sharedMaterial == null || rend.sharedMaterial.mainTexture == null || meshCollider == null)
                 return;
 
             Texture2D tex = rend.material.mainTexture as Texture2D;
             Vector2 pixelUV = hit.textureCoord;
             pixelUV.x *= tex.width;
             pixelUV.y *= tex.height;
 
             for (int i = 0; i < Size; i++)
             {
                 int x = (int)pixelUV.x;
                 int y = (int)pixelUV.y;
 
                 //Increment the X and Y
                 x += i;
                 y += i;
 
                 //Apply
                 tex.SetPixel(x, y, Color.red);
 
                 //De-increment the X and Y
                 x = (int)pixelUV.x;
                 y = (int)pixelUV.y;
 
                 x -= i;
                 y -= i;
 
                 //Apply
                 tex.SetPixel(x, y, Color.red);
             }
             tex.Apply();
         }
         Debug.DrawRay(transform.position, markerRange, Color.blue);
     }
 
 }

any idea on how i could do it beter are welcome.

A reference to the steam game the "lab" alt text