[vtk-developers] Multiple textures

Ken Martin ken.martin at kitware.com
Wed Oct 31 08:50:20 EDT 2018


At one time we supported multiple textures, then we didn't and now we do
again. So the archives do give a lot of conflicting answers.

On Tue, Oct 30, 2018 at 8:09 PM, Patrick Bergeron <pbergeron at spiria.com>
wrote:

> 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>
> 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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>
> --
> Ken Martin PhD
> Distinguished Engineer
> Kitware Inc.
> 101 East Weaver Street
> <https://maps.google.com/?q=101+East+Weaver+Street+%0D%0ACarrboro,+North+Carolina+%0D%0A27510+USA&entry=gmail&source=g>
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-- 
Ken Martin PhD
Distinguished Engineer
Kitware Inc.
101 East Weaver Street
Carrboro, North Carolina
27510 USA

This communication, including all attachments, contains confidential and
legally privileged information, and it is intended only for the use of the
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