[Bf-committers] Anymated textures in the 3Dview

[joe]

There's a function to update and get the image data,
image_update_for_frame or um something like this.  The backjground
image code does this.

Joe

On Wed, Feb 10, 2010 at 12:12 PM, Benoit Bolsee <benoit.bolsee at online.be> wrote:
> Hi,
>
> Recently, based on my status of the VideoTexture module mantainer, I've
> been asked whether video textures could be displayed dynamically in the
> 3D view (based on frame number). Unfortunately, the BGE and Blender use
> a different realtime render engine, so the VideoTexture module is no use
> in Blender.
>
> Nevertheless, I've studied the question and isolated the places in the
> code that must be changed to allow dynamic textures in the 3D view. I
> thought I would release this information as some Blender dev might want
> to implement the changes.
>
> /benoit
>
>>>>>> Here is the study:
>
> I finally had the time to look into that. It is not a simple problem. I
> have identified the 2 missing links to get animated texture in the 3D
> view but I'm not confident to implement them. The affected code is part
> of the Blender UI render engine that I'm not familiar with.
>
> I can give pointers to the code. Note that the following explanations
> are applicable to Blender 2.5.
>
> The function that is not doing the right thing is GPU_verify_image() in
> source/blender/gpu/gpu_draw.c This function is called whenever a
> textured face must be rendered in the 3D view. It calls the
> BKE_image_get_ibuf() function (line 447) to get the image buffer. Note
> that it uses a Image object, which is the central place in Blender where
> images are stored, including images from movies. It passes NULL as
> second argument, which means that the last loaded image from the movie
> will be returned.
>
> This is not a problem if the image corresponding to the current frame
> was loaded before this function is called. Unfortunately, there is no
> proper mechanism in Blender to ensure that. I found that displaying the
> Texture in the Button panel partially works: the frame number is updated
> whenever you modify something on that panel. This could be fixed by
> proper notifier/event but has the inconvenient that you have to keep the
> texture panel opened. A better way would be scan all Images (there is a
> global link of such objects) and update those pointing to movies
> whenever the frame number is changed. I don't think that is particularly
> difficult to do.
>
> The second problem is at line 446: if the image was already bound to a
> GPU texture, it simply rebinds and the image is not reloaded.  The
> proper load code is below at line 553. The idea would be to keep at
> Image level the number of the frame that was last loaded on the GPU and
> if it differs from the frame returned by BKE_image_get_ibuf, reload the
> image. Again I don't think this is complicated to do.
>
> <<<<<<
>
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