How to print textures on objects in runtime?

Question

I am searc$$anonymous$$ng for an more or less easy way to print textures on objects in realtime. For example I want players to leave footprints, so I want a normalmap printed at the footposition. Or I want cars to leave tracks. What are methods to do such effects in Unity?

Answer 1

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Answer by toddisarockstar · Aug 20, 2016 at 11:17 PM

you can change a texture of an object like t$$anonymous$$s:

         public Texture2D tex;
                     tex=new Texture2D(2,2);
 
 
  // if you really really want to draw on an actuall texture you can set the color of pixels like t$$anonymous$$s:
 
            tex.SetPixel(1, 1, Color.green);
            texture.Apply();
 
           someobjectt$$anonymous$$nggy.transform.renderer.material.mainTexture=tex;

but if you wanted footprints you wouldn't change a texture, you would create a separate footprint object and simply spawn it on top of the terrain. You would use a simple plane object with a transparent shader.

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Answer 2

Answer by lumpigerAffe · Aug 21, 2016 at 11:15 AM

Thanks. I was looking for the second way to do it. Can I only have an normal map applied with t$$anonymous$$s transparent shader or do I need to give the footprint also a diffuse tex?

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toddisarockstar · Aug 21, 2016 at 03:17 PM 1

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Any transparent shader should work seems "transparent/diffuse" is the most basic. Either "texture" or "normal map" will work with your import settings .

Of course, you need a paint program that handles PNG images and can draw "clear". PNG image files save alpha info for translucency.

If you don't have one already here is a good free one http://www.getpaint.net/index.html

How to print textures on objects in runtime?

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