Excellent Graechan.

Thank You

Graechan, you have so many super duper scripts now I am going to have to start a new folder called Graechan's Scripts next to the other script folder.

I'm having much difficulty trying to get this script to create the kind of perspective shadow I'm after.
Is there a way that you can give a detailed description of what the settings are for and give us a few examples of different kinds of shadows and there possible settings?

Angle
The angle determines the direction of the shadow or the imaginary source of light, respectively. Values range from 0° to 180°, where 90° represents a light source just in front of the selection or layer. For angles less than 90°, the shadow is at the right side, so the light source is on the left. For angles greater than 90°, it's the other way round. Tip: think of the slider's handle as source of light.

Relative distance of horizon
This option determines how far away the imaginary horizon is. The relative distance is the distance from the ground-line of the selection or layer, the “unit” of measurement is the height of the selection or layer.
Value range is from 0.1 to 24.1, where 24.1 means (nearly) “infinite”. Note that the relative length of shadow must not exceed the distance of horizon.

Relative length of shadow
With this option you can set the length of shadow with respect to the height of the selection or layer.
Value range is from 0.1 to 24.1, although the length of shadow must not exceed the relative distance of horizon - you can't go beyond the horizon.

Blur radius
After creating the shadow, a Gaussian blur with the specified radius is applied to the shadow layer, resulting in the realistic appearance of the shadow.

Color
Of course, the default color of the shadow is black. But a click on the button opens the color selector, where you may select any other color.

Opacity
The shadow's opacity is the opacity of the new layer containing the shadow

Interpolation
This drop-down list lets you choose the method of interpolation used when the shadow layer is transformed, for example rotated by the specified angle. Using None will usually result in aliasing, using any interpolation method may change the color of the shadow in some areas. Linear is a good choice.

Fade%
amount of graduated fade along the length of the shadow

Allow resizing
If enabled, the filter will resize the image if that is needed to make place for the shadow

I may not be the sharpest tool in the shed, but even with your explanation I'm not getting the kind of shadow I want.
The shadow in the image below took me a few minutes doing it manually. I can't figure out the settings of this script to produce this simple shadow. If I'm having issues with it, then there must be others experiencing the same thing with this script.

Looks good to me Wallace.

Thanks Molly, but have you tried to work with this script to produce a perspective shadow?
If not, give it a try and let us know how it goes.

thank you Graechan

ok, I will give it a try

I feel that this script could benefit from the addition of a preview window, showing it's results as the setting are entered; and or changed.
Good luck Molly.

2 different fonts
One layer
same default settings using perspective shadow

same font, same settings in perspective

Looks a bit off kilter to me.

I think what Wallace suggested would work very well. That is to have a preview window so we can see a live preview of what our settings will do.
Hint hint

Yes I understand what you're looking for. The Perspective Advanced.scm available in this thread could work; but I find it difficult to work with.
Why don't you give it a try to see how it works for you? Then post whatever results you come up with.

here are some tables, I hope somebody will find interesting

Angle variation