Fundamental issue: need to warp pyramid (I'll explain)

[Guest_2000123145]

Download: WarpedRectange.rbxl (66.3 KB)
Just press play and mess around for a bit

Alright, on with the post:

This is what I see:

Notice in the bottom right, the selection box:
https://i.gyazo.com/94c983bbf9e8441fcde2795c717ac997.mp4

For each corner of the selection box, using camera:ScreenPointToRay(x,y) I create a long edge part that shows the corner of my view:

You’ll notice the black shape. That’s just a regular square-based pyramid made by union-ing four corner wedges. I then get the: center of the four ends, of those rays. that were the corners of selection box, get the camera’s position, and set the cframe to in between those two.

I thought this would work, but I didn’t anticipate the warping that happens:

the resulting “rectangle” as viewed from the top when flattened:

The reason I’m doing all this is because I want to create a selection tool for roblox, and the method I’ve decided to use is workspace:GetPartsInPart(). It’s the most performant option I’ve found, and I know it works because I used it for a digital camera in one of my projects. The camera was in the center, therefore no warping.

I’ve been suggested to create 8 corners for each part in the workspace, a workspace with models of potentially thousands of parts, and they constantly change, move, more get added, etc.
I just don’t see how that won’t cause me to run at 10 fps every time my selection tool is out.

What would be the best way to select all the parts behind a Gui Frame?

Project all 8 corners into the viewport (WorldToViewportPoint) and if any corners are inside select the part.

How to create a Selection Box

I can’t seem to understand your question very well but, you could do something similar to this : Determine the world positions of each corners, using :ScreenPointToRay() Iterate through the instances, to significantly reduce the amount of parts to loop, you could put the selectable parts in a certain folder Check whenever the instance is within the rectangle bounds by comparing their positions or using :ToObjectSpace(), if so you could insert the part into an array Speaking performan…

Any other methods of selection I could potentially use? Maybe only doing the center of each part instead of 8 corners, or maybe I can create my view pyramid out of multiple parts somehow…

Either way, please leave suggestions.

Thanks!

[Guest_2000123145]

I could wrap my pyramid in more corner wedges:

Then I’d have to remove all the children of all the returned parts, then I’d have to clear any duplicates, and only then will I have an array of parts to select. Mind you this is happening every time I move the mouse, so I believe frame drops are unavoidable.

Please, leave suggestions or ideas

[iicloudsforeveriii (J10C)]

You could just get a 2d position of all the parts and then run a check on what parts are within the selection box. That’s what most people do.

[azqjanna]

I want you to think about how what you’re doing is mathematically different from projecting the corners into the screen and checking them against a rectangle.