Change color of particles by distance from emitter

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Hi!

I am trying to create a static grass area with particles and I've been researching how to change the color of the particles depending how far are from the emitter, but I had no luck. Because I need the grass to look yellow in the far edges of the grass area.

If you can point me in the right direction or have some similar shaders I will really appreciate it.

Thanks alt text

PD: why I am doing grass with particles? Great question, I am experimenting in ways to make great performance grass area for Augmented Reality in mobile. If you know any other way, let me know!

Answer 1

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Answer by richardkettlewell · Sep 04, 2018 at 08:06 PM

The only way to do this efficiently is to do it in the shader. You would need to write a custom shader to do it. Then you take the distance from each vertex to the Transform center, remap it to 0-1, and use that to blend the color towards your yellow color.

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reinabada · Sep 04, 2018 at 08:34 PM 0

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Thank you Richard! I will try to do it, I am a bit clumsy with shaders barely touch them but I am willing to try to do what you advise.

richardkettlewell ♦♦ · Sep 04, 2018 at 09:03 PM 0

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A tip: particles don’t set unity_LocalToWorld, so you must send Transform.position to the shader manually from a script. Good luck!

Answer 2

Answer by telecaster · Sep 04, 2018 at 08:52 PM

not sure if this helps: https://answers.unity.com/questions/1428669/color-of-vertex-based-on-player-distance.html

also there is a way to fake these things. https://assetstore.unity.com/packages/tools/utilities/amplify-impostors-beta-119877 allows hardware instancing which might help.

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reinabada · Sep 04, 2018 at 09:21 PM 0

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Thanks a lot! never used Amplify. Thanks for the suggestions.

Change color of particles by distance from emitter

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