I’m trying to manually render a VR camera into a double-wide RenderTexture the same way that the main camera would render with VR enabled. I don’t see any documentation stating that this isn’t supported, but it doesn’t appear to work. I upgraded to Unity 2017.1.03f because RenderTextureDescriptor.vrUsage seemed promising, but it doesn’t seem to do anything. The camera always renders just one eye. Here’s a snippet I’m using to test this:
using UnityEngine;
using UnityEngine.VR;
public class StereoTest : MonoBehaviour {
private Camera m_Camera;
void Awake() {
m_Camera = GetComponent<Camera>();
RenderTextureDescriptor desc = new RenderTextureDescriptor(
VRSettings.eyeTextureWidth * 2,
VRSettings.eyeTextureHeight,
RenderTextureFormat.Default,
24);
desc.vrUsage = VRTextureUsage.TwoEyes;
RenderTexture texture = new RenderTexture(desc);
texture.name = "Stereo RenderTexture";
texture.Create();
m_Camera.targetTexture = texture;
}
void LateUpdate() {
// Tested enabling UNITY_SINGLE_PASS_STEREO because it wasn't being set by the camera.
// Shader.EnableKeyword("UNITY_SINGLE_PASS_STEREO");
m_Camera.Render();
// Shader.DisableKeyword("UNITY_SINGLE_PASS_STEREO");
}
}
I was also unable to find an answer to this problem.
My solution was to create a left and right render textures seperately and combine them together into one large render texture using Graphics.Blit. The texture you blit onto must be twice the width as your left and right texture.
C# Code
//Merge Left Right Texture into Stereo Texture
RenderTexture lastActive = RenderTexture.active;
Graphics.Blit(m_TextureLeft, m_Texture, material, 0);
Graphics.Blit(m_TextureRight, m_Texture, material, 1);
RenderTexture.active = lastActive;
I will likely go a similar route to what you have done, but I was also hoping to harness the performance benefits of single pass stereo. If one of the Unity devs could chime in on whether or not this is supposed to be supported, that would be lovely. And if it’s not meant to be supported, what is the purpose of RenderTextureDescriptor.vrUsage?
This is a bug / limitation in Unity currently. Only cameras that render without Camera.Render support single pass stereo. Seems odd, but it is what it is.
I’m experiencing this same issue, trying to render a mask with a separate camera but no matter how I try and wrangle it, it doesn’t work. Hopefully it’s fixed soon
It seems that this is still not fixed. What is the point of the RenderTextureDescriptor.vrUsage flag if it doesn’t do anything? Whenever a camera’s targetTexture is set to a RenderTexture, it will return stereoEnabled false, regardless of the vrUsage flag on the RenderTexture. This basically makes it impossible to implement single-pass stereo reflections and other effects.
Was attempting to migrate form multi-pass to single-pass since the WMR plugin now only supports single-pass, same problem. Camera.Render() should use the same rendering properties (single-pass stereo) but will only render the left eye, no matter the “targetEye”
I’ve been trying to get my reflections in VR to render in a single-pass too. Then I found this thread.
It’s so dissapointing that this doesn’t work.
Is there anything we can do to encourage this to be possible?
Same issue here! Where do we vote to get this finally fixed? I multi-view render-textures so we can finally implement portals on quest without reverting to slow multi-pass rendering
This is not an issue anymore. I don’t have time now to write complete guides but you can definitely do postprocessing effects in single pass stere on quest 1 and 2. It differs based on unity version if you are using universal render pipeline as Unity is deprecating command buffer blit. The way you define render textures is fine, you probably have not used
UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(output);
UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
in your shader codes. Just keep reading the documentation and or pull some of unity made postprocessing effects for guidelines.
