benswift
commented
8 years ago Hi there
Thanks for the heads up, it looks cool and I'll have a look as soon as I can. The extempore mailing list (extemporelang@googlegroups.com) is probably a better place to advertise to the community, are you able to post it there as well?
Cheers Ben
j. kroll notifications@github.com writes:
I started writing a small
scene graph library. Its purpose is to create, animate and display some basic 3D shapes quickly, in an ad-hoc/livecoding fashion, without relying on external models. It is currently very basic. Handling of "primitives" (shapes) is similar tofluxus. What it can currently do:
- create some basic shapes on the fly (currently spheres, created from a subdivided octahedron, and cubes)
- modify their attributes (color, name, translation, scaling, rotation)
- render the scene graph recursively (i.e., transformation matrix of nodes also applies to their children)
- animate nodes with a convenience macro (simplifies
(callback)a bit)It is intended to be used from Scheme context, while the lib itself is written in xtlang, using graphics-pipeline.xtm for rendering nodes. Nodes are referred to using integer IDs, which should make it safe from crashes (important in a livecoding context).
Things that need to be added or fixed:
- no texturing yet
- there are memory leaks
- ID lookup is done by traversing the graph. Obviously this will be slow for larger graphs. I would use a hash or something similar, but I don't know how to do that in xtlang. glib hashes might work, but I'd rather not pull in glib for this.
- needs more primitives, and a simple particle system would be cool
- GLFW stuff should be improved, probably should have some basic camera modification using mouse input (like fluxus)
- documentation :)
Simple example:
(sys:load "simplescenegraph.xtm") (begin (scene_clear) (define sphere (build_sphere 2)) ; create a sphere with subdiv level 2 (define cube (build_cube)) ; and a cube (with-node cube ; convenience macro applies the following stuff to this node (translate 2 0 0) (scale .5 .5 .5) (color 0 1 0) ; green (parent sphere)) ; parent's transformations will be applied to this cube (with-node sphere (scale 2 2 2) (color 1 0 0) ; red (animate (/ 1 30) ; 'do this every 1/30 seconds' (lambda (node time dtime) (rotate_node .15 0 1 0)))) ; rotate around y axis (with-node 0 ; the root node (identity) (rotate_node 0.3 1 0 0)) ; rotate it a bit around the x axis (print_scene_graph))Another example is in
test1.xtm.I started this because I needed to get some location markers in 3-space on the screen quickly and I didn't want to rely on external models. I would be happy if this, or something similar, would be included in Extempore at some point. I am not used to thinking in Scheme, and I'm new to Extempore, so I'd be happy for any comments, suggestions, etc.
You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/digego/extempore/issues/279
kroll-j
I started writing a small
scene graph library. Its purpose is to create, animate and display some simple 3D shapes quickly, in an ad-hoc/livecoding fashion, without relying on external models. It is currently very basic. Handling of "primitives" (shapes) is similar tofluxus. What it can currently do:(callback)a bit)It is intended to be used from Scheme context, while the lib itself is written in xtlang, using graphics-pipeline.xtm for rendering nodes. Nodes are referred to using integer IDs, which should make it safe from crashes (important in a livecoding context).
Things that need to be added or fixed:
Simple example:
Another example is in
test1.xtm.I started this because I needed to get some location markers in 3-space on the screen quickly and I didn't want to rely on external models. I would be happy if this, or something similar, would be included in Extempore at some point. I am not used to thinking in Scheme, and I'm new to Extempore, so I'd appreciate any comments, suggestions, etc.