solved Make a Perfect Plane to Fit Frustum

[Pryme8]

So, I can definitely figure this math out but I was looking to see if there is a quick trick anyone can think of to make a plane fit exactly into the camera's frustum.

IE if I have a camera at (0,0,-10) and a view port that is 1:1 or even 1:1.5 ratio what size would a plane need to be to cover the whole viewport...  (I know I know simple math), I was hoping for a quick method if anyone has one though, no rush its not anything I actively need but would be useful for a side projects I am doing.

Basically what ShaderToy is doing.

*EDIT*
Ill prolly just use this https://docs.unity3d.com/Manual/FrustumSizeAtDistance.html

[jerome]

well, assuming that d is the distance from the camera to your plane, fov the camera fov angle and y the plane half height (and assuming that the frustum cam.minZ is still 1), then

y = d * tan(fov / 2)

and if x the half the plane width

x = y * camera.aspectRatio

if I remember well

[JCPalmer]

Unless, you do not want to care.  Switch to orthogonal camera an distance as long as z is neg.  Would not plane be, wait I'll check.

[JCPalmer]

window.innerWidth & window.innerHeight

[Pryme8]

@JCPalmer is that to get the aspectRatio?  That's what I am assuming but was wondering about your input.

[Pryme8]

@jerome, @JCPalmer : Thanks guys! https://playground.babylonjs.com/#UJWGY4

Your math off the top of you head was close homie!  not halfsizing the fov was the only change.

[jerome]

some little fixes imho : https://playground.babylonjs.com/#UJWGY4#1

[JCPalmer]

18 hours ago, Pryme8 said:

@JCPalmer is that to get the aspectRatio?  That's what I am assuming but was wondering about your input.

No simpler than that.  From a lack of math standpoint, I win!!!  I did switch to asking engine for the width, but no fov, tangent() calls, & my camera distance must only be less than the max z

[JCPalmer]

whoops, forgot to show the supporting playground https://playground.babylonjs.com/#UJWGY4#2

[Pryme8]

That's awesome! Way Clean!