Re: [Re: [Re: Ecartis command results: SUBSCRIBE]]

Roger,

Right now, it is just a simple system. While I do plan on extending it to=

support a few more things, right now it does none of that.

SFGL does the following:

o Ability to quickly bring up an OpenGL Window
o Pass floating point and double values to OpenGL DLL
o Control and render a complete entity system
o 1 simple, directional light (at the camera)
o A few built-in primitives to use (like cube, sphere, etc.)
o Picking entities with the mouse

Texture mapping, 3D model loading, etc. are all certainly possible, thoug=
h,
the way SFGL is set up. Let me explain:

Everything rendered is done through a subclass of Entity3D, which has a
defered function: DRAW, which is called by the engine each frame. In this=
, you
can use any and all OpenGL routines to construct your object. For example=
 (a
simple quad):

Entity3D SUBCLASS MyQuad

: DRAW ( -- )
    GL_QUADS :: glBegin
        -1e -1e 0e 3sfparms glVertex3f
         1e -1e 0e 3sfparms glVertex3f
         1e 1e 0e 3sfparms glVertex3f
        -1e 1e 0e 3sfparms glVertex3f
    :: glEnd ;

END-CLASS

As you can see, you could do texture mapping, etc. inside the DRAW functi=
on.
Now you can create a new quad and add it to the "world" with very little =
code,
too:

MyQuad BUILDS quad
quad SFGL-WORLD ADD-ENTITY

That's it. It will now be rendered each frame of animation. There are als=
o
functions for controlling each entity:

Entity3D -> STRAFE ( x -- )
Entity3D -> ELEVATE ( y -- )
Entity3D -> MOVEFORWARD ( z -- )
Entity3D -> Pitch ( degrees -- )
Entity3D -> Yaw ( degrees -- )
Entity3D -> Roll ( degrees -- )

Among others. You can also add limbs (using ADD-ENTITY) to any object. So=
 if
you add a sphere as a limb of your quad, above, then as you rotate the qu=
ad,
the sphere will rotate around it, etc.

That's about it right now. There are a few things I'm trying to work arou=
nd in
SwiftForth to make some things work, but overall I think it is a good sys=
tem.
I'll probably start back up on it in 2-4 weeks and throw up some sample c=
ode
on my website.

Jeff

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Received on Fri Nov 07 2003 - 16:06:23 PST