[Interest] Qt3D Reading from a Compute Shader

[Russell, Matthew]

>From the looks of it, I think that's exactly what I need. =D

I suspected it would be a RenderPass, but a child of the DispatchCompute makes sense too.  I'm also still pretty new at this.

As soon as I get 5.9a built, I'll give this a try in my code.

Thanks!

From: Interest [mailto:interest-bounces+mrussell=neptec.com at qt-project.org] On Behalf Of Juan José Casafranca
Sent: Wednesday, March 1, 2017 6:15 PM
To: interest at qt-project.org
Subject: Re: [Interest] Qt3D Reading from a Compute Shader


I wrote a patch for this some weeks ago. I think is already merged in Qt 5.9. Have a look at the buffercapture example (qt5/qt3d/tests/manual/buffercapture-qml).



Let me know if you have any trouble.



On miércoles, 1 de marzo de 2017 22:09:15 (CET) Russell, Matthew wrote:

> Hi,

>

> Is it possible with QML to read a buffer operated on by a compute shader?

>

> If I understood this message properly,

> http://lists.qt-project.org/pipermail/interest/2016-November/025167.html ,

> then this wasn't possible in 5.8, but might be available in 5.9.

>

> Specifically, I'm showing point data from a lidar in a multi viewport

> Scene3d. My Buffer is used in a Geometry that has a Material on it that

> performs a compute shader in the first pass, and then passes that data to

> the vertex shaders.

>

> My problem is that as I receive new point data from the lidar, I need to

> re-write my data, but I wanna capture the modifications the compute shader

> performed. Otherwise, the compute shader translates my point data

> properly, but when I re-push my buffer, all the translations are forgotten.

>

> Thanks.




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