[x3d-public] RenderedTexture support

Tue Jan 16 02:51:52 PST 2018

Hi,

Castle Game Engine and view3dscene support both RenderedTexture and all
cubemap nodes, including GeneratedCubeMapTexture .

See

https://castle-engine.sourceforge.io/x3d_implementation_texturing_extensions.php#section_ext_rendered_texture

https://castle-engine.sourceforge.io/x3d_implementation_cubemaptexturing.php

They work on all platforms (desktop and mobile - Android, iOS). We use
OpenGL(ES) FBO (Framebuffer Object) in both cases to efficiently capture
the rendered result to the texture. In case of GeneratedCubeMapTexture, we
can specify which face of the cubemap is currently written, so it's quite
efficient - the rendered contents are put by GPU straight into the proper
texture side.

See
https://github.com/castle-engine/castle-engine/blob/master/src/images/opengl/castleglimages_rendertotexture.inc
for our TGLRenderToTexture class that wraps FBO to expose all the necessary
features.

P.S. We also use this class for GeneratedShadowMap,
https://castle-engine.sourceforge.io/x3d_extensions_shadow_maps.php :)

Regards,
Michalis

16.01.2018 2:28 AM "Andreas Plesch" <andreasplesch at gmail.com> napisał(a):

> Hi Don,
>
> thanks for your response. Here is a first round of support links.
>
> http://www.xj3d.org/extensions/render_texture.html
>
> https://castle-engine.sourceforge.io/x3d_implementation_texturing_
> extensions.php#section_ext_rendered_texture
>
> Castle does not seem to have ComposedCubeMap or GeneratedCubeMap
>
> http://doc.instantreality.org/documentation/nodetype/RenderedTexture/
> was the template for the x3dom node.
>
> I suspect freeWrl supports imagecubemaps, probably composedcubemaps,
> only perhaps generatedcubemaps and renderedtexture.
>
> There are good screen capturing web browser extensions which can
> produce small and large animations, example gif attached.
>
> All the best,
> -Andreas
>
>
> On Mon, Jan 15, 2018 at 7:20 PM, Don Brutzman <brutzman at nps.edu> wrote:
> > Thanks for the analysis and suggestion.  No this node has never been
> > proposed for use in X3D.
> >
> > I searched and found documentation at
> >
> >         X3DOM documentation: Node: RenderedTexture
> >         https://doc.x3dom.org/author/Texturing/RenderedTexture.html
> >
> > "This extension provides the ability to dynamically render a partial
> > scenegraph to an offscreen texture that can then be used on the geometry
> of
> > a node. This can be used in many different ways such as creating mirror
> > effects, inputs to shaders etc. The purpose of this component is to
> provide
> > for extended visual effects, but not the complete form of offscreen
> > rendering and buffers that would be available to lower-level rendering
> > APIs."
> >
> > The fields are quite diverse and utilize multiple parts of a scene.  Some
> > further composition might be needed, worth closer scrutiny.
> >
> > It is certainly interesting to expose this kind of functionality to scene
> > authors.  If rendered results might be saved to a file, then it could
> also
> > increase options for interactions within HTML pages.
> >
> > The interpupillary distance field looks like something we would defer to
> X3D
> > v4.1 for Mixed Augmented Reality (MAR) VR/AR applications.
> >
> > It would be great if someone wanted to lead the effort to add this node,
> and
> > perhaps closely related nodes.
> >
> > On 1/16/2018 7:39 AM, Andreas Plesch wrote:
> >>
> >> Dear group,
> >>
> >> x3dom has a RenderedTexture node which very useful. Prompted by a
> >> x3dom-user list question, I started to think about using
> >> RenderedTextures as faces for a ComposedCubeMapNode which is also
> >> available in x3dom albeit only for ImageTexture sources.
> >>
> >> Although I first thought it is technically difficult due to webgl
> >> limitations, after deep diving it turned out that there is a way to
> >> efficiently use gl textures (generated for RenderedTexture) as faces
> >> for gl cube map textures (using gl.copyTexImage2D()).
> >>
> >> So I am developing in my cubemap branch of x3dom the ability for
> >> ComposedCubeMapNode to use RenderedTexture which can be updated per
> >> frame, for dynamic mirror effects and probably other uses. Here is an
> >> example:
> >>
> >>
> >> https://rawgit.com/andreasplesch/x3dom/cubemap/
> test/regression-suite/test/cases/cubemap/colorcube.html
> >>
> >> It more or less works but before I go further I would like to know how
> >> other browser approach dynamic cube maps from a high level. There is
> >> also the x3d GeneratedCubeMapNode which is intended for this effect.
> >> So one question would be which players actually implement a
> >> GeneratedCubeMapNode.
> >>
> >> There are quite a few x3d browsers which have a RenderedTexture node.
> >> Do they allow using it with ComposedCubeMap ?
> >>
> >> A big question is how recursive mirror in mirror are handled.
> >>
> >> Is a RenderedTexture node a target for v.4 ?
> >>
> >> Any feedback much welcome,
> >>
> >> Andreas
> >>
> >
> >
> > all the best, Don
> > --
> > Don Brutzman  Naval Postgraduate School, Code USW/Br
> brutzman at nps.edu
> > Watkins 270,  MOVES Institute, Monterey CA 93943-5000 USA
> +1.831.656.2149
> > X3D graphics, virtual worlds, navy robotics http://faculty.nps.edu/
> brutzman
>
>
>
> --
> Andreas Plesch
> Waltham, MA 02453
>
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