|
|
|
|---|
|
The image-map on the grandfather-clock
· With the knowledge we have gathered so far, it is easy to apply the ornament to the frontside of the grandfather- clock. All you have to do is to create a cube, scale it to the right proportions and then attach the image-file »ornat.gif« to it (you can download this image by clicking here) · There is now only one thing left. The box with the ornament is absolutely square, but we want something more elliptical as can be seen in the picture. We can't project the ornament-image onto a cylinder and scale it afterwards, because the map would be projected along the Y-axis of the cylinder. So we keep the box and apply a CSG-intersection on it. This - if you recall - leaves only those parts of the box, that lie within the box itself and the intersecting cylinder. Doing so, we can cut off the edges of the box without affecting the image-map- projection. |
Image-maps and finish-parameters
· When combining image maps and regular textures you will soon notice, that there are grave differences in the way light interacts. This has one simple reason. For every texture you can use, there is a specific declaration in POVLAB.INC or one of your custom-include files. POV-Ray examines these declarations and calculates the surface upon the found defaults. On the other hand, there's just an assortment of pixels and nothing tells POV-Ray how - for example - light is reflected. · In order to adapt image-maps to the rest of a scene, you can use the finish-parameter-settings, we heard about in the texture-section of chapter A (can't recall ? wanna have a quick look ? Allright - click here). Sure, most of the finish-settings will have no or not the wanted effect when applied to an image-map, but at least it is possible to adjust the brightness altering the »diffuse«- and »ambiance«-values. |
| Chapter B/Page 13 | 
| 
| 
|
|
Mail to webmaster:
support@povlab.org This page was last modified on: 1996-08-04 |
Mail to the author of the POVLAB-Tutorial:
lepschi@source.co.at |