GL.LINES and GL functionality with URP

Unity Engine
1

I’m hoping to use some of the GL.*() class of functions, in particular rendering with GL.LINES. However, I tried upgrading my project to the LWRP, and those functions no longer seem to work/render.

Is that in the roadmap for LWRP (or any of the custom render pipelines), is there a workaround for using GL.LINES currently, or is that something that I’d have to create custom on top of the LWRP?

2

Actually I imagine it’s something related to this issue , which I’d posted earlier, or will have a similar response.

3

How are you drawing the GL.LINES?

4

Previously, I was rending the lines in OnPostRender(), on the main camera:

void OnPostRender() {
    GL.PushMatrix();
    lineMaterial.SetPass(0);
    GL.Begin(GL.LINES);
    foreach(var l in linesList) {
        GL.Vertex3(l.p0.x, l.p0.y, l.p0.z);
        GL.Vertex3(l.p1.x, l.p1.y, l.p1.z);
    }
    GL.End();
    GL.PopMatrix();

    return;
}

I’ve since migrated rendering to the objects themselves, using OnRenderObject():

public void OnRenderObject() {
    GL.PushMatrix();
    lineMaterial.SetPass(0);
    GL.Begin(GL.LINES);
    foreach (var l in linesList) {
        GL.Vertex3(l.p0.x, l.p0.y, l.p0.z);
        GL.Vertex3(l.p1.x, l.p1.y, l.p1.z);
    }
    GL.End();
    GL.PopMatrix();
    return;
}

In both cases, the lines render properly in the legacy rendering system, but they don’t render at all with the LWRP.

5

I have the same issue with GL.LINE_STRIP, worked with normal post processing, LW only displays the lines in scene view not game view. Same installs as nickfourtimes. I’ve tried 2018.3.3f1 and the latest beta 2019.1.0b1.

6

Could you guys open a bug report for this? We’ll take a look at it.

7

Sent.

1 Like
8

Shall I provide the same or is there/will there be an open issue # to contribute to?

9

I recommend you send yours in. We can compare answers :smile:

1 Like
10

Alrighty, I’ve submitted a bug along with a repro project; I can provide a case ID if that would help.

2 Likes
11

Looks like they’ve been able to reproduce the problem and have sent it along for investigation.

1 Like
12

Are you winning? Doesn’t look good my end, I’m told that GL is going to be deprecated in LWRP :confused: Which pushes me back to the normal post processing.

13

I haven’t heard back from them at all, but this was pretty much what I was expecting. Luckily using LWRP isn’t a dealbreaker for me, and I can run fine with legacy rendering, but I was hoping to use LWRP to future-proof the project at least a little bit.

Hopefully folks will come up with a custom RP in the future that supports GL commands, but that’s way outside my wheelhouse.

14

It’s not the same but worth looking at if you haven’t already…

http://www.everyday3d.com/blog/index.php/2010/03/15/3-ways-to-draw-3d-lines-in-unity3d/

scene: linesGR

4184692--370234--Capture.PNG

15

Hi, regarding the two issues:

  1. Debug.DrawLines work as expected. However the rendering callbacks are deprecated in SRP. We are adding atm a callback to render after camera is finished.
  2. GL.* API can be replaced with CommandBuffer.DrawMesh and CommandBuffer.DrawProcedural Unity - Scripting API: CommandBuffer
1 Like
16

Ok well thanks for everything phil. For the time being I’m going back to the regular v2 PostProcessing. When I have the time I’ll likely implement the drawmesh for LW. :slight_smile:

17

~ update ~

I’ve migrated along to Unity 2019.3.0b6, and it seems like the GL.Lines are working!

1 Like
18

I’ve the same problem. When using LWRP OnRenderObject / OnPostRender is not called in game. My unity’s edition is 2019.3.2f1，

19

what should i set up ?

20

Hm. I’m essentially calling this code in 2019.3.1f1:

    void OnRenderObject() {
        myMaterial.SetPass(0);
        GL.Begin(GL.LINES);
        {
            GL.Vertex(from);
            GL.Vertex(to);
        }
        GL.End();

        return;
    }

…and it’s working just fine. I’m using URP since the upgrade/rename, rather than LWRP, not sure if that changes anything.