GEM ONLINE DOCUMENTATION CHAPTER 3: LIST OF OBJECTS
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These are all of the GEM objects
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Controls
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camera - the "view" into the world
gemhead - the start of rendering chain
gemwin - the window manager
render_trigger - outputs a bang when the chain renders

Manipulators
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alpha - enable/disable alpha blending
color - set the color with a vector
colorRGB - set the color with 3 discrete values
depth - enable/disable depth testing
rotate - rotate with an angle and vector
scale - scale with a vector
scaleXYZ - scale with 3 discrete values
separator - push the OpenGL state for the rest of the chain and pop when done
translate - translate with a vector
translateXYZ - translate with 3 discrete values

Geos
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circle - render a circle
cone - render a cone
cube - render a cube
curve - render a Bezier curve
imageVert - make pixel colors to a height field map
model - render an Alias|Wavefront model
multimodel - render a series of Alias|Wavefront models, render by number
polygon - render a polygon
sphere - render a sphere
square - render a square
text2d - render 2-D text (a bitmap)
text3d - render 3-D text (polygonal)
textoutline - render outlined text (polygonal)
triangle - render a triangle

Nongeos
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light - make a point light
world_light - make a light at infinity

Pixes
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pix_2grey - convert rgb pixels to grey (still an RGBA image)
pix_alpha - set the alpha value of a pix
pix_add - add two pixes together
pix_bitmask - apply a bitmask to a pix
pix_buf - buffer a pix
pix_color - set the color of a pix (leaving alpha alone)
pix_composite - composite two pixes together
pix_convolve - convolve a pix with a kernal
pix_coordinate - set the texture coordinates
pix_draw - draw a pix
pix_flip - flip the pixels of a pix
pix_gain - apply a gain to a pix
pix_image - load in an image file
pix_invert - invert a pix
pix_mask - mask a pix based on another pix
pix_multiply - multiply two pixes
pix_multiimage - load in a series of image files, display by number
pix_resize - resize a pix to next power of 2
pix_snap - capture the render window into a pix
pix_subtract - subtract two pixes
pix_texture - use a pix as a texture map
pix_threshold - apply a threshold to a pix
pix_zoom - zoom into a pix (using OpenGL)

SGI and NT only
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pix_video - use a video camera as a pix source
