In Microsoft Internet Explorer and Netscape Navigator, hold down the SHIFT key and click the mouse on the file's link. Now follow your browser's instructions to download file.
Check the version of POV ray you downloaded. You may have DL'd the 3.1 BETA by mistake. You should ignore the 3.1 BETA and get version 3.02. I want you to be able to use a stable product over the course of the class and not have to fight BETA bugs.
Here's what you do: Go to the POV homepage. Off the main menu on the left, choose DOWNLOAD. Now, page down and bypass the 3.1 BETA. Keep going and you will see the links to get the version 3.02 links.
First, include the file you are using (e.g. glass.inc, gold.inc, etc) at the top of your POV scene file (.POV). Second, enclose the defined texture identifier in a texture statement like this:
#include "glass.inc"// --- other statements in POV file ---
sphere
{
<0, 2, 0> // center of sphere <X Y Z>
1.3 // radius of sphere
texture{ T_Ruby_Glass }
}
This particular statement will give a sphere a ruby glass-like transparent finish.
Open the render settings window (either via toolbar button or RENDER | EDIT SETTINGS/RENDER menu option). At the bottom, in the long text field marked command line options, put a +FC. This option tells the render to dump the files as type-10 compressed right out of POV...a REAL time saver when doing multiple images.
Note: I have had problems with this feature in the past. My Graphics Viewer application of choice is Microsoft Photo Editor that comes with Win95 and it does a good job of easily compressing the files.
"An additive color system expresses a color, D, as the sum of certain primaries, usually red, green, and blue: D = RGB(r,g,b). An aditive system can use any 3 primaries, but because red, green, and blue are situated far apart in the CIE chart, they provide a large gamut.
Subtractive color systems are used when it is natural to think in terms of removing colors. When light is reflected (diffusely) from a surface or is transmitted through a partially transparent medium (as when photographic filters are used), certain colors are absorbed by the material and thus removed. This is a subtractive process.
A subtractive color system expresses a colod, D, by means of a 3-tuple, just as an additive system does, but each of the three values specifies how much of a certain color (the complement of the corresponding primary) to remove from white in order to produce D. To clarify this, consider the most common subtractive system, the CMY system, which uses the subtractive primaries cyan, magenta, and yellow. If we say that D = CMY(c,m,y), we are saying that D is formed from white by subtracting the amount c of the complement of cyan (i.e., red), amount m of the complement of magenta (green), and amount y of the complement of yellow (blue). Thus, we immediately have the following relationship betwen the RGB and CMY systems:
RGB(r,g,b) = (1,1,1) - CMY(c,m,y)
That is, the amount of blue b in a color is reduced by increasing y, as y specifies the amount of yellow's complement to remove from white."
In other words, an additive color system starts with black or zero and each of the three values of RGB specifies how much color to add to black until you get the result you want. In a subtractive color system, you start with white and each of the three values of CMY specifies how much color to remove from white until you get the result you want. As you know by now, we are using an additive system using RGB as primary colors.
Source: Computer Graphics, Hill