Projection map slot in corona lights

Corona Lights would benefit from the ability to apply and focus a projection map.

Ive found myself doing a lot of stage lighting work recently and needing to simulate things like gobos.

Currently i cant see a way to achieve a gobo with a corona light. It can be faked with standard and photometric. But neither of them provide a full solution.

You can use photometric lights, however the intensity settings are completely incorrect when using corona shadows in a photometric light (i had to crank the photometric light to 450,000 lumens to match the 3000 lumens of the corona light with the same IES).

They also require an IES profile to appear in volumetric materials and passes.

Whilst i understand that a projection map is a 'fake'. If the only way to achieve the desired result of a gobo filter, is to use a photometric light, with corona shadows and a projection map. Then you also have to eyeball the light intensity, surely corona can provide a better solution than that natively because at that point its compounding three or four fakes to achieve a shaped volumetric ray which could be achieved in corona by allowing users to adjust focus of the texture you can currently apply to corona lights.

It would need to work in conjunction with the IES profile for it to be fully featured.

To be able to create ANY masked light (Gobo) effect currently, there are no options that provide the full feature set required outside of building a full lens array with caustics. None of the available options provide the ability to use physical light units, a projection map (or gobo light filter) and an IES file together and none of the proposed 'compromises' address the actual feature request or provide the required end result. Putting a plane over a corona light with an assigned IES does not create the correct result because of the issue around the focal plane.

In an ideal scenario, the corona light would have the ability to apply a mask to the light that can be focussed and blurred independently and allow it to mask the projected IES shape. This would allow stage and theatre lighting to be correctly reproduced essentially across the board as well as other helpful workflow tools such as applying animated tree shadows or fake caustics.

I have attached an image explaining why none of the currently available options work correctly.

See this forum thread where I rant in depth about why this feature is needed.

https://forum.corona-renderer.com/index.php?topic=39789.msg211545#msg211545