Is there something like SetCameraScissor()?

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Scraggle

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Posted: 11th Nov 2018 12:32 Edited at: 11th Nov 2018 12:34

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Hey,

I'm trying to restrict the 3D rendering to a section of the screen but don't know if it's possible.
It looks like a combination of SetCameraBounds() and SetCameraOffCenter() might be what I need but the help files don't really explain the commands very well.

Is it possible?

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Bengismo

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Posted: 11th Nov 2018 14:53 Edited at: 11th Nov 2018 15:38

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SetCameraBounds and SetCameraOffCentre are indeed what you need and you can then render the 3d to any square area of the screen if wanted or render multiple views etc...

I did an example a while ago and posted it on here but not sure if I can find the thread.

EDIT:
https://forum.thegamecreators.com/thread/222064

Can be done using SetScissor() and the above commands

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smallg

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Posted: 11th Nov 2018 17:02

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you could also render to an image and then scissor that? just an option if you don't get the above working.

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Scraggle

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Posted: 12th Nov 2018 12:46

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Thanks,
I've had a look at it and it seems like it will do what I want - not sure about the calculations though

I need to scissor the 3D render to the full screen width and the lower 90% of the screen. Something to think about when I've had more coffee ....

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Bengismo

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Posted: 12th Nov 2018 13:44

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You might just be over thinking this:

SetScissor(0,0.1*GetDeviceHeight(),GetDeviceWidth(),GetDeviceHeight())

That will render the 3d only to the bottom 90% of the screen but using full screen width. You only need to use SetCameraBounds if you want to centre the 3d view in the lower 90% - Doubt you need this as its barely noticeable when your using 90% of the screen anyway.

The maths for projection matrices are...hmm....fun!

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Scraggle

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Posted: 12th Nov 2018 13:58 Edited at: 12th Nov 2018 14:01

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Hey,

You're right, I was overthinking it!!!
What I needed to do is render the 2D to the full screen and have the 3D rendered over the top of it.
Simple enough with a reorder of the render commands.
The problem I had was the HUD elements would then appear beneath the 3D and since they occupy only the top 10% of the screen (I'm using percentage mode) then scissoring is all I needed.

Here's my working code should anyone stumble across this while looking for something similar:

+ Code Snippet

function mySync()
	SetScissor(0,0,0,0)
	Update(0)
	Render2DBack()
	ClearDepthBuffer()
	Render2DFront()
	SetScissor(GetScreenBoundsLeft(), GetScreenBoundsTop() + 10, GetScreenBoundsRight(), GetScreenBoundsRight())
	Render3D()
	Swap()
endfunctionn

Thanks Bengismo

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