Picture to Unwrapped Texture to Object

Unity Engine
1

Hello!

I am kinda new to this topic and seem to be a little bit stuck.

I am currently trying to build a mobile app, where i can load one or more pictures, and use those as a texture for an 3D Object. I created the Object in Blender and unwrapped it.

What i am trying to do is, managing those multiple pictures kinda like ‘layers’ in photoshop, and when i click a Button, i want them to be put together on one ‘layer’ (would be a texture then) and to use the created texture as texture of the object.

This works fine for a single picture, because all i have to do is load the pic as texture and place it on my object. But for multiple layers i don’t know how to do this.

I tried different things.

My first approach: I created a Shader that is capale of loading multiple textures and loads in the layers by a naming convention. This works ok, but doesn’t really cover the layer hierarchy because it just overlays the textures.

My second approach: Using a camera output as render texture. Making a ‘Snapshot’ of it and putting the snapshot on the object. The problem with this is, that setting up the correct parameters of the cameras viewrect is pretty painfull, because i have to keep the aspect ratios and size exactly the same as the texture i take a picture of, otherwise it won’t fit to the unwrap of my model! Since i want to be able to do this with multiple different models and textures i would like to get this to work dynamically so i don’t think this is of any good…

Does anyone have tried something like this before? Any ideas on what would be the best practise to achieve what i am trying to do?

Any help would be highly appreciated!

Thanks in Advance
Bob

2

I don’t understand that part, isn’t what layer are supposed to do?

3

Well, i guess. but first of all i don’t think shaders are capable of defining something like a list of textures right? I’d have to hardcode every texture i want to be able to use on my shader. This could become a problem when users want to add and remove layers dynamically. And the second problem i think i have allthough i’m not sure about that, is that it seems to be difficult to define layers that completely ‘cover’ the layer that lies underneath.

4

Why not do it manually using texture2d? You don’t have to do it using render texture.

5

Well i DID try that actually! But i seem to have thrown away the code allready.
The problem with that approach was, that combining the Texture2Ds resulted in weird clipped images. Transparency seems to be a problem with this approach. Or is there any way to avoid this? What’s the best way to combine multiple textures?

Btw, i don’t necessarily NEED to use RenderTexture, i just thought it would be a good solution from what i know, but that isn’t very much yet ;D

EDIT: The other thing i forgot to mention, is that i want the user to be able to rotate and move the textures. I achieved moving textures by changing the offset of the texture, but i don’t know how to rotate and i can’t find anything about it. SO i thought if i use a rendertexture i just rotate the object and let the snapshot do the rest