Documentation:Tutorial Section 3 - Revision history

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technical correction

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2016-12-16T14:08:32Z

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Jholsenback: suggested rewording

2016-05-23T11:16:35Z

suggested rewording

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2016-05-03T22:44:20Z

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2012-08-17T10:46:51Z

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2012-07-23T19:27:38Z

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2012-07-21T18:23:31Z

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2012-07-01T12:00:01Z

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2012-06-30T18:36:27Z

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ThorstenFroehlich at 19:53, 26 November 2011

2011-11-26T19:53:14Z

@@ Line 250: / Line 250: @@
 </table>
-<p>Finally there is another kind of quadratic spline, the <code>bezier_spline</code>. This one takes four points per section. The start point, the end points and in between, two control points. To use it, we will have to make a few changes to our work shop. Delete the Yellow point, delete the Yellow cylinder. Change the points to:</p>
+<p>Finally there is another kind of cubic spline, the <code>bezier_spline</code>. This one takes four points per section. The start point, the end points and in between, two control points. To use it, we will have to make a few changes to our work shop. Delete the Yellow point, delete the Yellow cylinder. Change the points to:</p>
 <pre>
    #declare Red_Point    = &lt;2.00, 1.00&gt;;

@@ Line 9: / Line 9: @@
 ==Advanced Features==
 <!--<sectiondesc desc=<"advanced tutorial">--->
 {{#indexentry:Shapes, spline based}}
 <p>After we have gained some experience with the simpler shapes available in
 POV-Ray it is time to go on to the more advanced, thrilling shapes.</p>
@@ Line 23: / Line 23: @@
 before proceeding with these advanced shapes.</p>
 {{#indexentry:lathe, tutorial}}
 <p>In the real world, <code><!--<linkto "lathe">lathe</linkto>--->[[Reference:Lathe|lathe]]</code> refers to a process of making patterned rounded shapes by spinning the source material in place and carving pieces out as it turns. The results can be elaborate, smoothly rounded, elegant looking artefacts such as table legs, pottery, etc. In POV-Ray, a lathe object is used for creating much the same kind of items, although we are referring to the object itself rather than the means of production.</p>
 <p>
@@ Line 95: / Line 95: @@
 in the end, it is a matter of: we use a SOR if its limitations will allow, but
 when we need a more flexible shape, we go with the lathe instead.</p>
 {{#indexentry:Splines, understanding the concept of}}
 <p>It would be helpful, in order to understand splines, if we had a sort of <em>Spline Workshop</em> where we could practice manipulating types and points of splines and see what the effects were like. So let's make one! Now that we know how to create a basic lathe, it will be easy:</p>
 <pre>
@@ Line 383: / Line 384: @@
 <p>The concept of splines is a handy and necessary one, which will be seen again in the prism and polygon objects. It's easy to see, that with a little tinkering, how quickly we can get a feel for working with splines.</p>
 {{#indexentry:sor, tutorial}}
 <p>Bottles, vases and glasses make nice objects in ray-traced scenes. We want
 to create a golden cup using the <em>surface of revolution</em> object (SOR
@@ Line 464: / Line 464: @@
 any height.</p>
 {{#indexentry:prism, tutorial}}
 <p>The prism is essentially a polygon or closed curve which is swept along a
 linear path. We can imagine the shape so swept leaving a trail in space, and
@@ Line 517: / Line 516: @@
 too casual about those warning messages!</p>
 {{#indexentry:Spline, new tricks}}
 {{#indexentry:cubic_spline, tutorial}}
 <p>If we followed the section on splines covered under the lathe tutorial
 (see the section <!--<linkto "Understanding The Concept of Splines">Understanding The Concept of Splines</linkto>--->[[Documentation:Tutorial Section 3#Understanding The Concept of Splines|Understanding The Concept of Splines]]), we know that
@@ Line 651: / Line 650: @@
 any number of extremely complex prism shapes!</p>
 {{#indexentry:Tapering Conic Sweeps}}
 <p>In our original prism, the keyword <code>linear_sweep</code> is actually
 optional. This is the default sweep assumed for a prism if no type of sweep
@@ Line 777: / Line 776: @@
 is cut off depends on how close the first height is to the second height.</p>
 {{#indexentry:sphere_sweep, tutorial}}
 <p>A Sphere Sweep Object is the space a sphere occupies during its movement along a spline.
 <br>So we need to specify the kind of spline we want and a list of control points to define
@@ Line 843: / Line 842: @@
 sweep, but does not actually go through the control points. It lies somewhere between them.</p>
 {{#indexentry:bicubic_patch, tutorial}}
 <p>
 Bicubic patches are useful surface representations because they allow an easy definition
@@ Line 1,150: / Line 1,149: @@
 </table>
 {{#indexentry:text, tutorial}}
 <p>The <code>text</code> object is a primitive that can use TrueType fonts
 and TrueType Collections to create text objects. These

@@ Line 79: / Line 79: @@
 first glance. It too declares a series of points and connects them with
 curving lines and then rotates them around the y-axis. The lathe has certain
-advantages, such as different kinds of splines, linear, quadratic and cubic,
+advantages, such as linear, quadratic, cubic and bezier spline support.</p>
 <p>
-The simpler mathematics used by a SOR does not allow the curve to double
+Plus, the simpler mathematics used by a SOR does not allow the curve to double
 back over the same y-coordinates, thus, if using a SOR, any sudden twist
 which cuts back down over the same heights that the curve previously covered
@@ Line 385: / Line 384: @@
 {{#indexentry:sor, tutorial}}
 ====Surface of Revolution Object====
 <p>Bottles, vases and glasses make nice objects in ray-traced scenes. We want

@@ Line 517: / Line 517: @@
 too casual about those warning messages!</p>
-{{#indexentry:Spline, new tricks|cubic_spline, tutorial}}
+{{#indexentry:Spline, new tricks}}
 =====Teaching An Old Spline New Tricks=====
 <p>If we followed the section on splines covered under the lathe tutorial

@@ Line 855: / Line 855: @@
 Bicubic patches are almost always created by using a third party modeler, but for this tutorial
 we will manipulate them by hand. Modelers that support Bicubic patches and export to POV-Ray
-can be found in the [http://www.povray.org/links/ links collection on our server]<br>
+can be found in the [http://www.povray.org/resources/links/ links collection on our server]<br>
 Let's set up a basic scene and start exploring the Bicubic patch.
 </p>
@@ Line 1,150: / Line 1,150: @@
 {{#indexentry:text, tutorial}}
 ====Text Object====
 <p>The <code>text</code> object is a primitive that can use TrueType fonts

← Older revision	Revision as of 19:27, 23 July 2012
(No difference)

@@ Line 407: / Line 407: @@
 <p>We will use the point configuration shown in the figure above. There are eight points describing the curve that will be rotated about the y-axis to get our cup. The curve was calculated using the method described in the
-reference section (see <!--<linkto "Surface of Revolution">Surface of Revolution</linkto>--->[[Reference:Sor|Surface of Revolution]]).</p>
+reference section (see <!--<linkto "Surface of Revolution">Surface of Revolution</linkto>--->[[Reference:Surface of Revolution|Surface of Revolution]]).</p>
 <p>
 Now it is time to come up with a scene that uses the above SOR object. We
@@ Line 465: / Line 465: @@
 {{#indexentry:prism, tutorial}}
 ====Prism Object====
 <p>The prism is essentially a polygon or closed curve which is swept along a

← Older revision	Revision as of 12:00, 1 July 2012
(No difference)

@@ Line 25: / Line 25: @@
 {{#indexentry:lathe, tutorial}}
 ====Lathe Object====
-<p>In the real world, <code><!--<linkto "lathe">lathe</linkto>--->[[Documentation:Reference Section 4#Lathe|lathe]]</code> refers to a process of making
+<p>In the real world, <code><!--<linkto "lathe">lathe</linkto>--->[[Reference:Lathe|lathe]]</code> refers to a process of making patterned rounded shapes by spinning the source material in place and carving pieces out as it turns. The results can be elaborate, smoothly rounded, elegant looking artefacts such as table legs, pottery, etc. In POV-Ray, a lathe object is used for creating much the same kind of items, although we are referring to the object itself rather than the means of production.</p>
 <p>
 Here is some source for a really basic lathe.</p>
@@ Line 411: / Line 406: @@
 </table>
-<p>We will use the point configuration shown in the figure above. There are
+<p>We will use the point configuration shown in the figure above. There are eight points describing the curve that will be rotated about the y-axis to get our cup. The curve was calculated using the method described in the
-eight points describing the curve that will be rotated about the y-axis to
+reference section (see <!--<linkto "Surface of Revolution">Surface of Revolution</linkto>--->[[Reference:Sor|Surface of Revolution]]).</p>
 <p>
 Now it is time to come up with a scene that uses the above SOR object. We
@@ Line 856: / Line 849: @@
 of the control points. A single patch has 16 control points, one at each corner, and the rest
 positioned to divide the patch into smaller sections. POV-Ray does not ray trace the patches
-directly, they are approximated using triangles as described in the
+directly, they are approximated using triangles as described in the <!--<linkto "bezier">Scene Description Language</linkto>--->[[Reference:Bicubic Patch|Scene Description Language]] section.
 </p>
 <p>