The integer "Scale" is just the number of screen pixels per "unit of length". Thus, the larger you set Scale, the larger details will look on the screen. However this will not show any extra detail unless you also increase the resolution parameters at the same time.
The Set Morphing... dialog allows you to set the initial and final values of the nine parameters, aa, bb, ..., ii, during a morph (and, for the surface category, the initial and final values of umin, umax, vmin, vmax). That is, during a morphing animation the initial and final frames are drawn using these initial and final values, and the values for the intermediate frames are determined by linear interpolation. Often it is convenient to set the initial and final values to the current values and then make a few modifications. To do this, click on the button "Init to Current Parameters".
The number (N) of frames in a filmstrip determines how an animation will play out, and can be chosen independently for the three types of filmstrips (morphing, oscillation, and rotation). For example, if you choose Rotation from the Animate Menu, the filmstrip created will consist of a full rotation of 360 degrees about the Rotation Axis, each frame being (360/N) degrees rotated from the preceding, where N is the number of frames in a rotation filmstrip. Making N large will give a smoother rotation that takes longer to play through the loop once. Choosing Oscillate from the Animate Menu will create a sequence of N frames, each rotated 5 degrees from the preceding one, where N is now the number of frames in an oscillation filmstrip. This give a quick way of seeing a smooth rotation through a smaller range. There is also a parameter, Rotation Divisor, that can be set in the Set Number of Frames... dialog. If this is set to an integer n, then a rotation filmstrip with N frames will only rotate 360/Nn degrees between frames (rather than 360/N), so it will only rotate a total of 360/n degrees (instead of 360 degrees). Of course this will produce a sudden jump at the end of each time thru the filmstrip unless the object being displayed is invariant under a 360/n degree rotation about the rotation axis. But if this is the case, then a smooth rotation can be created using many fewer frames.
The Custom... item of the Set Light Sources submenu of the Settings menu brings up one of the more complex dialogs of the program. This lets the user set the color of the five light sources (Source0, Source1, Source2, Source3, and AmbientSource) and the direction of the light rays from Source1, Source2, Source3. The two parameters that determine the characteristics of specular reflection from a surface (Specular Exponent and Specular Ratio) are also set using this dialog. This dialog is used in combination with the Set Coloration submenu of the Surface menu to determine the color of a surface when the Color item of the View menu is chosen. See the section on color for more details.