[vtk-developers] Multiple textures

[Patrick Bergeron]

You rock.


I will give it a try. Not sure how I missed it.


BTW, Google is my friend, but I kept finding this link whatever search terms I gave google.


http://vtk.1045678.n5.nabble.com/Using-multile-texture-files-in-vtkOBJImporter-td5744430.html




"It is possible to have multiple texture maps applied to a single surface where the texture maps are blended together using a blending function. That is the part we do not support. "


I wasn't sure what to make of that comment!   :-)

Many other places in archives also state that only one texture and one texture coordinate is supported...





________________________________
From: Ken Martin <ken.martin at kitware.com>
Sent: October 30, 2018 3:16:10 PM
To: Patrick Bergeron
Cc: vtk-developers at public.kitware.com
Subject: Re: [vtk-developers] Multiple textures

I responded yesterday so maybe check your spam folder etc.  Here is the link

https://markmail.org/thread/7gtvznk7jql7uv74



On Tue, Oct 30, 2018 at 3:10 PM, Patrick Bergeron <pbergeron at spiria.com<mailto:pbergeron at spiria.com>> wrote:

Hi folks. I sent this a while back on vtk-users but got no response.



I am sending this to vtk-developers because if the features isn't implemented, I will implement it.


I am trying to pass multiple texture buffers to a fragment shader.


I saw I can do:


1) actor->SetTexture(vtkTexture*) takes only a single vtkTexture


2) actor->GetProperty()->SetTexture(int unit, vtkTexture*) takes a texture that I can associate to a texture unit, but those functions are deprecated.


In fact, I think that (2) doesn't even work anymore with the OpenGL2 backend, at least my shader code doesn't seem to be getting them, maybe I am doing something wrong. In any case, I get a vtk warning saying I should not do that.



Some folks have said I should combine multiple images into a single image before sending as a texture image. But I can't do this, because I need to send texture images as well as multiple data (non-image) buffers to the shader as well.


How can I attach multiple image buffers to the actor and/or ogl mapper?



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