OpenGL mouse picking with ray casting

[kayomarz]

Hi, I've been experimenting with kons-9 and object picking and created a branch - opengl-mouse-picking-with-ray-casting

Would look forward to comments and suggestions.

Have also created draft pull request #222 only to help compare code and get comments.

The pull request also describes how to try out the object picker, although the picking isn't very accurate yet.

[kaveh808]

Nice work. This is promising. If you can get ray geometry intersection (as opposed to ray AABB) working, that would be a great addition to the system.

[kayomarz]

Have implemented ray geometry intersection in the same branch. Please see this comment in the original draft PR - #222 (comment)

[kaveh808]

Very nice. I'll review the code changes in the next few days.

[kayomarz]

I will make a few more commits over the next 3 days and ping you once its done so you can review the whole thing together. Thanks Kaveh.

[kayomarz]

@kaveh I have committed the updates and updated the PR description, ready for review.

[kaveh808]

Thank you. I will review the changes soon.

[aykaramba]

amazing.

[kaveh808]

Made a small update so mouse-click will not crash when shapes do not have an intersect method.

[kayomarz]

Did it crash with the boid system / growth environment? I think adding an intersect method for shape-group will be an improvement. It turns out that shape-group does not need to be tested for intersection because find-shapes which is being used, traverses all shapes including those in a shape-group.

[kaveh808]

It crashed when I clicked in a scene with a curve in it.

[kaveh808]

I'm wondering if we could/should implement a WebGPU back end:

https://www.reddit.com/r/lisp/comments/1552s8i/crossplatform_webgpu_from_cl/

[kayomarz]

not being up to date with GPU backends/APIs I'm not the best person to add my two cents :) Since WebGPU is designed to support computational capabilities apart from graphics I find it an interesting technology to keep an eye on.

[kaveh808]

Good point.

[awolven]

The vulkan backend is cross platform and requires less dependencies than a webgpu backend. I'm a little offended that you say this yet have not used the vulkan backend I spent six weeks coding for you.

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On Wed, Jul 26, 2023 at 2:41 PM Kaveh Kardan ***@***.***> wrote: I'm wondering if we could/should implement a WebGPU back end: https://www.reddit.com/r/lisp/comments/1552s8i/crossplatform_webgpu_from_cl/ — Reply to this email directly, view it on GitHub <#223 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AABGMMLGT64DR6LKRHJQR5LXSFXFBANCNFSM6AAAAAAZCQQ44U> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[kaveh808]

I apologize if I dropped the ball. Integrating the Vulkan code was beyond my knowledge, and no one stepped forward to tackle it.

Personally, I'm satisfied with the simple OpenGL 1.1 functionality for now, but keep an eye on eventual enhancements. I came across an article which claimed WebGPU was the cross-platform-and-browser solution for the future. Don't know if that's the case.

[kayomarz]

I will attempt to merge the vulkan code into our main branch. I haven't worked with Vulkan but it will be a good learning opportunity. This is a great project and I would be happy to contribute just as all of you have done so far. I will check out the earlier discussions about it and take it on from there.

[kaveh808]

That would be very helpful. Thank you @kayomarz .

Let's make the Vulkan feature as an option alongside the existing OpenGL if possible. At least until I can become more familiar with the functionality.

[kayomarz]

@kaveh808 I tried pushing a small fix to the main branch related to object picking but the push failed due to no permissions.

Have made a PR instead: #234

[kaveh808]

Done. Thanks.

[kayomarz]

With PR #235 we should also be able to pick lines and curves.