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Assets/SteamVR/Extras/SteamVR_TestTrackedCamera.cs

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+//======= Copyright (c) Valve Corporation, All rights reserved. ===============
+using UnityEngine;
+
+public class SteamVR_TestTrackedCamera : MonoBehaviour
+{
+	public Material material;
+	public Transform target;
+	public bool undistorted = true;
+	public bool cropped = true;
+
+	void OnEnable()
+	{
+		// The video stream must be symmetrically acquired and released in
+		// order to properly disable the stream once there are no consumers.
+		var source = SteamVR_TrackedCamera.Source(undistorted);
+		source.Acquire();
+
+		// Auto-disable if no camera is present.
+		if (!source.hasCamera)
+			enabled = false;
+	}
+
+	void OnDisable()
+	{
+		// Clear the texture when no longer active.
+		material.mainTexture = null;
+
+		// The video stream must be symmetrically acquired and released in
+		// order to properly disable the stream once there are no consumers.
+		var source = SteamVR_TrackedCamera.Source(undistorted);
+		source.Release();
+	}
+
+	void Update()
+	{
+		var source = SteamVR_TrackedCamera.Source(undistorted);
+		var texture = source.texture;
+		if (texture == null)
+		{
+			return;
+		}
+
+		// Apply the latest texture to the material.  This must be performed
+		// every frame since the underlying texture is actually part of a ring
+		// buffer which is updated in lock-step with its associated pose.
+		// (You actually really only need to call any of the accessors which
+		// internally call Update on the SteamVR_TrackedCamera.VideoStreamTexture).
+		material.mainTexture = texture;
+
+		// Adjust the height of the quad based on the aspect to keep the texels square.
+		var aspect = (float)texture.width / texture.height;
+
+		// The undistorted video feed has 'bad' areas near the edges where the original
+		// square texture feed is stretched to undo the fisheye from the lens.
+		// Therefore, you'll want to crop it to the specified frameBounds to remove this.
+		if (cropped)
+		{
+			var bounds = source.frameBounds;
+			material.mainTextureOffset = new Vector2(bounds.uMin, bounds.vMin);
+
+			var du = bounds.uMax - bounds.uMin;
+			var dv = bounds.vMax - bounds.vMin;
+			material.mainTextureScale = new Vector2(du, dv);
+
+			aspect *= Mathf.Abs(du / dv);
+        }
+		else
+		{
+			material.mainTextureOffset = Vector2.zero;
+			material.mainTextureScale = new Vector2(1, -1);
+		}
+
+		target.localScale = new Vector3(1, 1.0f / aspect, 1);
+
+		// Apply the pose that this frame was recorded at.
+		if (source.hasTracking)
+		{
+			var t = source.transform;
+			target.localPosition = t.pos;
+			target.localRotation = t.rot;
+		}
+	}
+}
+