Hello everyone,
I am seeking your help with an issue I am encountering in Unreal Engine 5, specifically with the use of IES textures for linear lighting products. I am working with IES textures designed for emissive surfaces of approximately 1500mm x 75mm.
When I apply these IES textures to a rectangular light, the response seems inadequate. For example, in the attached screenshot “camera_UE5.png”, you can see a rectangular light with the IES texture applied on the right side. The issue is that the light beam produced appears narrower than the total emission surface of the light.
To better illustrate my point, I have also provided a similar image created in Blender, showing the result I was hoping to achieve.
I would like to add that we encountered a similar issue in Blender, which we circumvented using nodes. However, in Unreal Engine, I am unable to achieve the same result.
I am also attaching the IES file used in this case for your reference.
It seems that the problem may be related to the rendering engine incorrectly calculating the IES texture.
Any help or suggestions to resolve this issue would be greatly appreciated.
Thank you in advance for your assistance.
