How to create the sun in a space sim?

Muunich · June 12, 2014, 2:47am

Greetings,

I am having trouble with creating the Sun in a space sim game I am making. I am very new to UE and game development so forgive me for this simple question.

First off, I am using a directional light to simulate the light from the sun and have “Used as Atmosphere Sun Light” checked. Although this directional light is correctly lighting my environment, whenever I hit play I can not actually see the object emitting the light (the sun).

How would I go about visually seeing an object representing the sun in my environment?

In addition, I would like to have the object representing the sun give off a glowing effect.

Any help is greatly appreciated.

Thanks

Munich

ambershee · June 12, 2014, 3:43am

You’d surely want a mesh representing the sun?

Muunich · June 12, 2014, 4:22am

If I created a mesh representing the sun (centered on the directional light) and applied a material to it how would I get that material to glow properly (like the sun does) if the light is inside that mesh?

ambershee · June 12, 2014, 4:49am

These questions are so basic, you should be able to answer them yourself by spending five minutes playing with the editor and you should definitely spend time with the documentation and example content before trying to implement things.

Directional lights are directional. They have no location, only a direction, so it’s completely irrelevant where you place the actor.
If you selected your sun mesh and looked at it’s properties, you’d notice you can tell it not to cast shadows.
Using lights to make things glow is nonsense. The material applied to the sun needs to be emissive.

Muunich · June 12, 2014, 2:36pm

Thanks for your reply. Yes, it is evident that I need to spent a lot more time with the documentation. I will create my sun mesh and tell it not to cast shadows and apply an emissive material to it like you mention. Thanks again.

Munich

Muunich · June 12, 2014, 6:00pm

JBaldwin;74311:

@ Muunich - Some people can be a bit harsh with their response for some reason. Don’t take it to heart. Just like the documentation is there to help you, so are these forums. The fact that you came here “first” and asked the questions you did is quite normal and shouldn’t be scrutinized. So, in the future, if you have any questions, post away. Someone who is nice will get back to you sooner or later

To reiterate on your questions:

The reason you are unable to see the sun, is due to the fact that there isn’t a sun object (i.e. mesh). The sphere mesh you create needs to have all shadow information disabled. Not just (Cast shadows) but also receiving shadows, etc. This way, it is left out of the shadow calculation process since this object is going to be “unlit” within its material and solely driven through the emissive channel - since it’s a giant ball of plasma

In order to get the mesh to glow like the sun, you need to create an emissive material. Here is a lava material. As you can see, there are a few panning and rotating nodes that are plugged into a texture that is then plugged into the emissive channel of the material.

Another element of the “Glow” is going to be your Post Process and Bloom settings which you can find Here.

Give me a few minutes and I will whip something up for you

You are very kind good sir. I do like criticism, it makes me work harder and makes me more determined I really appreciate your detailed response. I am currently @ work (3D mathematical modeller) and will implement this later tonight.

Thanks

Muunich

jwatte · June 12, 2014, 9:10pm

You want to give your sun a bright, emissive color, and you may want to give it a color value that’s greater than 1.0. Values greater than 1 will cause bloom in post process, which makes it look brighter than it is.
So, for example, you could create a sphere, and give it the constant emissive color red=5, green=3, blue=0.5. Make the material itself be unlit, and make the mesh not cast shadows.

Muunich · June 13, 2014, 1:27am

@JBaldwin

Just implemented your material and its glorious! I really appreciate you sharing your knowledge and providing your example :D. This helps me tremendously with the workflow and how these things are done.

@jwatte

Thanks for that info. With that I was able to tweak the right amount of ‘glow’ that I wanted.

Drexciya · June 13, 2014, 9:46am

Great posts and attitude JBaldwin, good for the community!

Muunich · June 13, 2014, 5:13pm

Totally agree 100%.

omikun · June 13, 2014, 8:02pm

Just wanted to post and thank JBaldwin! It’s so incredibly helpful for a newbie like myself.

DCrosby · July 24, 2016, 4:22pm

I’d like to add a Blueprint that allows you to place your sun along the direction of your directional light, so it’s easier to visualize where the sun’s position is.

In the BP Instance, make sure to connect your directional light, and set a distance, these put the sun at the very edge of my skydome, which worked for me.

This Code is intended for the Construction BP, so it will not auto-update, so if you move the directional light, move the SunBP a bit, and the sun position will update.

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AutogeneratedDefaultValue=“0, 0, 0”
LinkedTo(0)=EdGraphPin’K2Node_CallFunction_11.EdGraphPin_89’
End Object
bIsPureFunc=True
FunctionReference=(MemberParent=Class’/Script/Engine.KismetMathLibrary’,MemberName=“Multiply_VectorInt”)
Pins(0)=EdGraphPin’EdGraphPin_91’
Pins(1)=EdGraphPin’EdGraphPin_92’
Pins(2)=EdGraphPin’EdGraphPin_93’
Pins(3)=EdGraphPin’EdGraphPin_94’
NodePosX=-48
NodePosY=160
NodeGuid=8ED4A1AC4A972E81D425DF96080F343B
End Object

Tronological · September 4, 2017, 12:18am

This is gorgeous, great work.