Error: You are trying to upload data for texture created with external texture pointer

Hi,
I,m working on the SteamVR_TestTrackedCamera script... I want to make the central pixel coloured ... Here is the code ...

Code (CSharp):

1. //======= Copyright (c) Valve Corporation, All rights reserved. ===============
2. using UnityEngine;
3.  
4. namespace Valve.VR.Extras
5. {
6.     public class SteamVR_TestTrackedCamera : MonoBehaviour
7.     {
8.         public Material material;
9.         public Transform target;
10.         public bool undistorted = true;
11.         public bool cropped = true;
12.  
13.  
14.         private void OnEnable()
15.         {
16.             // The video stream must be symmetrically acquired and released in
17.             // order to properly disable the stream once there are no consumers.
18.             SteamVR_TrackedCamera.VideoStreamTexture source = SteamVR_TrackedCamera.Source(undistorted);
19.             source.Acquire();
20.  
21.             // Auto-disable if no camera is present.
22.             if (!source.hasCamera)
23.                 enabled = false;
24.         }
25.  
26.         private void OnDisable()
27.         {
28.             // Clear the texture when no longer active.
29.             material.mainTexture = null;
30.  
31.             // The video stream must be symmetrically acquired and released in
32.             // order to properly disable the stream once there are no consumers.
33.             SteamVR_TrackedCamera.VideoStreamTexture source = SteamVR_TrackedCamera.Source(undistorted);
34.             source.Release();
35.         }
36.  
37.         private void Update()
38.         {
39.             SteamVR_TrackedCamera.VideoStreamTexture source = SteamVR_TrackedCamera.Source(undistorted);
40.             Texture2D texture = source.texture;
41.             if (texture == null)
42.             {
43.                 return;
44.             }
45.  
46.             // Apply the latest texture to the material.  This must be performed
47.             // every frame since the underlying texture is actually part of a ring
48.             // buffer which is updated in lock-step with its associated pose.
49.             // (You actually really only need to call any of the accessors which
50.             // internally call Update on the SteamVR_TrackedCamera.VideoStreamTexture).
51.  
52.  
53.  
54.      
55.             material.mainTexture = texture;   //associa il material alla texture per farmi vedere il mondo esterno proiettato sul quad
56.  
57. // Here the part of code I have added ----------------------------------
58.  
59.            Color32 color = new Color32(0, 255, 0, 0);
60.          
61.            texture.SetPixel(texture.width / 2, texture.height / 2, color); //equivalente a dire texture.SetPixel(64, 64, color);
62.            texture.Apply();
63.  
64. //-----------------------------------------------------------------------------------
65.  
66.  
67.             // Adjust the height of the quad based on the aspect to keep the texels square.
68.             float aspect = (float)texture.width / texture.height;
69.  
70.                 // The undistorted video feed has 'bad' areas near the edges where the original
71.                 // square texture feed is stretched to undo the fisheye from the lens.
72.                 // Therefore, you'll want to crop it to the specified frameBounds to remove this.
73.                 if (cropped)
74.                 {
75.                     VRTextureBounds_t bounds = source.frameBounds;
76.                     material.mainTextureOffset = new Vector2(bounds.uMin, bounds.vMin);
77.  
78.                     float du = bounds.uMax - bounds.uMin;
79.                     float dv = bounds.vMax - bounds.vMin;
80.                     material.mainTextureScale = new Vector2(du, dv);
81.  
82.                     aspect *= Mathf.Abs(du / dv);
83.                 }
84.                 else
85.                 {
86.                     material.mainTextureOffset = Vector2.zero;
87.                     material.mainTextureScale = new Vector2(1, -1);
88.                 }
89.  
90.                 target.localScale = new Vector3(1, 1.0f / aspect, 1);
91.  
92.                 // Apply the pose that this frame was recorded at.
93.                 if (source.hasTracking)
94.                 {
95.                     SteamVR_Utils.RigidTransform rigidTransform = source.transform;
96.                     target.localPosition = rigidTransform.pos;
97.                     target.localRotation = rigidTransform.rot;
98.                 }
99.             }
100.         }
101.     }
102.  

However when I run the code I can't see the coloured pixel and the console gives me this error:

You are trying to upload data for texture created with external texture pointer
UnityEngine.Texture2D:Apply()
Valve.VR.Extras.SteamVR_TestTrackedCamera:Update() (at Assets/SteamVR/Extras/SteamVR_TestTrackedCamera.cs)

Can someone help me solve? Thank you.

 

This sounds pretty specific to the API you're using. You might find people more familiar with it over in the AR/VR/XR group on this forum.

 

Ok, Thank you!