Bethopedia

Drawing Commands

• GL_POINTS //Unconnected
• GL_LINES // Unconnected
• GL_LINE_STRIP // Connected
• GL_POLYGON // Closed
• GL_TRIANGLES // Separate
• GL_TRIANGLE_STRIP // Joined
• GL_TRIANGLE_FAN // Joined all connected at p0
• GL_QUADS // Separate
• GL_QUAD_STRIP // Joined
• GL_LINE // Sets drawing method to outline
• GL_FILL //Sets drawing method to fill
• GL_FRONT_AND_BACK vs GL_FRONT vs GL_BACK // Which faces get drawn

Enable Options

• GL_BLEND // Blending alpha values
• GL_LIGHTING // Enable lighting as a whole
• GL_LIGHT0 // Enable an individual light (can do this for LIGHT1, etc up to at least LIGHT7)
• GL_LINE_SMOOTH
• GL_NORMALIZE // Turns on auto-normalisation of normals
• GL_MULTISAMPLE
• GL_POLYGON_OFFSET_(POINT|LINE|FILL) // enable offsetting to prevent z fighting
• GL_TEXTURE_2D // Allows use of textures

Camera

• GL_PROJECTION //Pyramid (foreshortening)
• GL_ORTHOGRAPHIC //Rectangular Prism

Lights

• GL_POSITION // Sets the position of the lights ource
• GL_AMBIENT/GL_SPECULAR/GL_DIFFUSE/GL_SHININESS // Sets the light/material type
• GL_LIGHT_MODEL_AMBIENT // Sets the global ambient data
• GL_SPOT_CUTOFF // Says that we’re setting the angle for the spotlight
• GL_SPOT_EXPONENT // Says that we’re setting the brightness
• GL_SPOT_DIRECTION // Says that we’re setting the direction vector
• GL_CONSTANT_ATTENUATION/GL_LINEAR_ATTENUATION/GL_QUADRATIC_ATTENUATION // Each factors in the attenuation equation (by default there is no attenuation in OpenGL - setting these 3 things changes that)

Textures