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Make a Perfect Plane to Fit Frustum


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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.

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

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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

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