How to use IES files with sim3d.Light

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kenichi tanaka
kenichi tanaka 2024-8-8
评论： Nishan Nekoo 2024-11-13，18:46
I am trying to visualize the light distribution of an IES file using Simulink 3D Animation.
I created an object with sim3d.Light and specified the IES file in the IESFilePath property, but the light distribution displayed is that of a PointLight instead of the one defined in the IES file.
How can I ensure that the contents of the IES file are applied?
Below is the code comparing PointLight and SpotLight:
% Code to compare PointLight, SpotLight, and IES light distribution
% The lights illuminate the road surface from the left lane with PointLight, SpotLight, and IES (grid pattern).
% The sun altitude cannot be changed, so it is displayed during the day, but the lights are bright enough to be visible.
world = sim3d.World('Scene',"Straight road");
light1 = sim3d.Light(ActorName='Light1',Translation=[0,-6,1],Rotation=[0,0,0],LightType='PointLight');
light2 = sim3d.Light(ActorName='Light2',Translation=[0,-2,1],Rotation=[0,-pi/4,0],LightType='SpotLight');
light3 = sim3d.Light(ActorName='Light3',Translation=[0,2,1],Rotation=[0,0,0]);
light3.IESFilePath = "TestImg.IES";
world.add(light1);
world.add(light2);
world.add(light3);
viewport = createViewport(world);
viewport.Translation = [-3,-2,4.5];
viewport.Rotation = [0,-pi/4,0];
run(world,0.01,3)
delete(world);
I have attached the IES file used and a PNG showing the light distribution from this file.
The IES file is compressed in a zip archive as it cannot be uploaded directly.
  2 个评论
Abhinav Aravindan
Abhinav Aravindan 2024-8-13
For a better understanding of the problem, please provide the IES file you are using.
kenichi tanaka
kenichi tanaka 2024-8-19
Thank you for pointing that out.
I was considering using a public resource, but instead, I created a grid pattern data for better clarity.

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采纳的回答

Nishan Nekoo
Nishan Nekoo 2024-11-6，14:31
Hi Tanaka-san,
It seems like the IES file is not getting imported because of path issues. IESFilePath requires a full system path.
Using the following line should resolve the issue:
>> light3.IESFilePath = fullfile(pwd, "TestImg.IES");
Nishan
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kenichi tanaka
kenichi tanaka 2024-11-13，5:44
Hi Nishan,
Thank you for your prompt response.
  • R2024b: The issue seems to be resolved in R2024b, as it works correctly according to the image you provided.
  • Fatal Error Cause:The fatal error occurs when the IES file path contains double-byte characters. This issue persists even in R2024b.
  • R2024a: Even when the fatal error does not occur, the file is not recognized in R2024a.
  • Lighting on the Road Surface: The brightness appears unusual. As it is a lighting fixture, it should only increase brightness, but this light seems to be able to make the environment darker. Additionally, it seems point lights are still enabled.
I see potential uses for this feature and hope it will display correctly.
Best regards,
Kenichi
Nishan Nekoo
Nishan Nekoo 2024-11-13，18:46
Hi Kenichi,
Thank you so much for your valuable feedback. I am glad that you are seeing the issue be resolved in R2024b. However, as you noted, there are two more issues regarding the unusual brightness and the point light still being enabled. I agree that these are both issues and we will investigate them internally. In the meantime, I will also look into whether any workarounds are available and get back to you.
Nishan

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