Documentation:Tutorial Section 2.1 - Revision history

Jholsenback: ambient to emission

2017-09-30T23:32:07Z

ambient to emission

Clipka: Indexentries fix

2016-12-16T14:06:07Z

Indexentries fix

Clipka: indexentry fix

2016-05-03T22:40:56Z

indexentry fix

Jholsenback: 1 revision: link repair after reference reorg

2012-07-01T11:59:59Z

1 revision: link repair after reference reorg

Jholsenback: link repair

2012-06-30T00:05:38Z

link repair

ThorstenFroehlich at 19:45, 26 November 2011

2011-11-26T19:45:45Z

ThorstenFroehlich at 19:43, 26 November 2011

2011-11-26T19:43:15Z

Show changes

Jholsenback: continue cleanup pass

2010-09-16T14:13:53Z

continue cleanup pass

Jholsenback: added placeholder

2010-03-25T06:59:38Z

added placeholder

Jholsenback: heading chages

2010-03-25T06:38:14Z

heading chages

@@ Line 542: / Line 542: @@
        texture {
          pigment {color rgb &lt;1, 1, 1&gt;}
-         finish {ambient .8 diffuse .6}
+         finish {emission .8 diffuse .6}
+       }
+     }
@@ Line 566: / Line 566: @@
 <p>Rendering this we see that a fairly believable light bulb now illuminates
-the scene. However, if we do not specify a high ambient value, the light bulb
+the scene. However, if we do not specify a high value for <code>emission</code>, the light bulb
 is not lit by the light source. On the plus side, all of the shadows fall
 away from the light bulb, just as they would in a real situation. The shadows
@@ Line 584: / Line 584: @@
 the x-z-plane. We also note that the actual appearance of the light bulb is
 not affected in any way by the light source. The bulb must be illuminated by
-some other light source or by, as in this case, a high ambient value.</p>
+some other light source or by, as in this case, a high value for <code>emission</code>.</p>
 =====Using Light Fading=====

@@ Line 8: / Line 8: @@
 <!--</wikitalk>--->
 <!--REMOVE--->===CSG Objects===<!--THIS--->
 {{#indexentry:Intersection, CSG}}
 {{#indexentry:intersection, tutorial}}
 <p>Now let's use these same spheres to illustrate the <code>intersection</code> CSG
 object. We change the word <code>union</code> to <code>intersection</code> and
@@ Line 32: / Line 32: @@
 differences.</p>
 {{#indexentry:Difference, CSG}}
 {{#indexentry:difference, tutorial}}
 <p>We rotate the lens-shaped intersection about the y-axis so that the broad
 side is facing the camera.</p>
@@ Line 130: / Line 130: @@
 <p>We render the file again. This looks pretty good... only... we can see
 parts of each of the lens objects inside the union! This is not good.</p>
 {{#indexentry:Merge, CSG}}
 {{#indexentry:merge, tutorial}}
 <p>This brings us to the fourth kind of CSG object, the <code>merge</code>.
 Merges are the same as unions, but the geometry of the objects in the CSG
@@ Line 148: / Line 149: @@
 <p>Sure enough, it does!</p>
 {{#indexentry:Pitfalls, CSG}}
 <p>There is a severe pitfall in the CSG code that we have to be aware of.</p>
 {{#indexentry:Surfaces, co-incident}}
 <p>POV-Ray uses inside/outside tests to determine the points at which a ray
 intersects a CSG object. A problem arises when the surfaces of two different
@@ Line 193: / Line 195: @@
 some of the involved objects.</p>
 {{#indexentry:Light Source, the}}
 {{#indexentry:light_source, tutorial}}
 <p>In any ray-traced scene, the light needed to illuminate our objects and
 their surfaces must come from a light source. There are many kinds of light
@@ Line 201: / Line 203: @@
 very impressive results. Let's take a moment to explore some of the
 different kinds of light sources and their various parameters.</p>
 {{#indexentry:Pointlight Source, the}}
 <p>Pointlights are exactly what the name indicates. A pointlight has no size,
 is invisible and illuminates everything in the scene equally no matter how
@@ Line 279: / Line 282: @@
 illuminated evenly all the way to the horizon. This allows us to see the
 plane, but it is not very realistic.</p>
 {{#indexentry:Spotlight Source, the}}
 {{#indexentry:light_source, spotlight, tutorial}}
 <p>Spotlights are a very useful type of light source. They can be used to add
 highlights and illuminate features much as a photographer uses spots to do
@@ Line 342: / Line 346: @@
 balance.</p>
 {{#indexentry:Cylindrical Light Source, the}}
 {{#indexentry:light_source, cylinder, tutorial}}
 <p>Spotlights are cone shaped, meaning that their effect will change with
 distance. The farther away from the spotlight an object is, the larger the
@@ Line 360: / Line 364: @@
 to do the job. We try a radius of 20 and a falloff of 30 for all three
 lights. That's the ticket!</p>
 {{#indexentry:Area Light Source, the}}
 {{#indexentry:light_source, area_light, tutorial}}
 <p>So far all of our light sources have one thing in common. They produce
 sharp shadows. This is because the actual light source is a point that is
@@ Line 459: / Line 464: @@
 shadows have small, tight umbrae, just the sort we would expect to find on an
 object under a real spotlight.</p>
 {{#indexentry:ambient_light, tutorial}}
 <p>The <em>ambient light source</em> is used to simulate the effect of
 inter-diffuse reflection. If there was not inter-diffuse reflection all
@@ Line 480: / Line 486: @@
 </pre>
 <p>See [[Reference:Global Settings#Ambient_Light|Ambient Light]] for more details.</p>
 {{#indexentry:Light Sources, special}}
-====Light Source Specials====
 {{#indexentry:Shadowless Lights, using}}
 {{#indexentry:light_source, shadowless, tutorial}}
 <p>Light sources can be assigned the <code>shadowless</code> keyword and no
 shadows will be cast due to its presence in a scene. Sometimes, scenes are
@@ Line 508: / Line 516: @@
 give a dim illumination to all objects including the plane in the background.
 We render it and see.</p>
 {{#indexentry:Light Source, assigning an object to}}
 {{#indexentry:Object Lights}}
 {{#indexentry:light_source, looks_like, tutorial}}
 <p>Light sources are invisible. They are just a location where the light
 appears to be coming from. They have no true size or shape. If we want our
@@ Line 576: / Line 585: @@
 not affected in any way by the light source. The bulb must be illuminated by
 some other light source or by, as in this case, a high ambient value.</p>
 {{#indexentry:Light Fading, using}}
 {{#indexentry:Fading Light}}
 {{#indexentry:light_source, fade_power, tutorial}}
 <p>If it is realism we want, it is not realistic for the plane to be evenly
 illuminated off into the distance. In real life, light gets scattered as it
@@ Line 610: / Line 620: @@
 distance of 10. Again, this works well. The falloff is much faster with a
 fade power of 2 so we had to raise the fade distance to 10.</p>
 {{#indexentry:Texture Options, simple}}
 <p>The pictures rendered so far where somewhat boring regarding the
 appearance of the objects. Let's add some fancy features to the
 texture.</p>
 ====Surface Finishes====
 <p>One of the main features of a ray-tracer is its ability to do interesting

@@ Line 508: / Line 508: @@
 give a dim illumination to all objects including the plane in the background.
 We render it and see.</p>
-{{#indexentry:Light Source, assigning an object to|Object Lights}}
+{{#indexentry:Light Source, assigning an object to}}
 {{#indexentry:light_source, looks_like, tutorial}}
 =====Assigning an Object to a Light Source=====
@@ Line 575: / Line 576: @@
 not affected in any way by the light source. The bulb must be illuminated by
 some other light source or by, as in this case, a high ambient value.</p>
-{{#indexentry:Light Fading, using|Fading Light}}
+{{#indexentry:Light Fading, using}}
 {{#indexentry:light_source, fade_power, tutorial}}
 =====Using Light Fading=====

@@ Line 284: / Line 284: @@
 <p>Spotlights are a very useful type of light source. They can be used to add
 highlights and illuminate features much as a photographer uses spots to do
-the same thing. To create a spotlight simply add the <code><!--<linkto "spotlight">spotlight</linkto>--->[[Documentation:Reference Section 4.4#Spotlights|spotlight]]</code>
+the same thing. To create a spotlight simply add the <code><!--<linkto "spotlight">spotlight</linkto>--->[[Reference:Light Source#Spotlights|spotlight]]</code>
 keyword to a regular point light. There are a few more parameters with
-spotlights than with pointlights. These are <code><!--<linkto "radius">radius</linkto>--->[[Documentation:Reference Section 4.4#Spotlights|radius]]</code>,
+spotlights than with pointlights. These are <code><!--<linkto "radius">radius</linkto>--->[[Reference:Light Source#Spotlights|radius]]</code>,
-<code><!--<linkto "falloff">falloff</linkto>--->[[Documentation:Reference Section 4.4#Spotlights|falloff]]</code>, <code><!--<linkto "tightness">tightness</linkto>--->[[Documentation:Reference Section 4.4#Spotlights|falloff]]</code>
+<code><!--<linkto "falloff">falloff</linkto>--->[[Reference:Light Source#Spotlights|falloff]]</code>, <code><!--<linkto "tightness">tightness</linkto>--->[[Reference:Light Source#Spotlights|falloff]]</code> and <code><!--<linkto "point_at">point_at</linkto>--->[[Reference:Light Source#Spotlights|point_at]]</code>. The <code>radius</code> parameter is the angle of the fully illuminated cone. The <code>falloff</code> parameter is the angle of the <em>umbra</em> cone where the light falls off to darkness. The <code>tightness</code> is a parameter that determines the rate of the light falloff. The <code>point_at</code> parameter is just what it says, the location where the spotlight is pointing to. Let's change the light in our scene as follows:</p>
 <pre>
    light_source {
@@ Line 485: / Line 479: @@
    global_settings { ambient_light rgb&lt;1, 0, 0&gt; }
 </pre>
-<p>See [[Documentation:Reference Section 3.1#Ambient_Light|Ambient Light]] for more details.</p>
+<p>See [[Reference:Global Settings#Ambient_Light|Ambient Light]] for more details.</p>
 {{#indexentry:Light Sources, special}}
 ====Light Source Specials====
@@ Line 635: / Line 629: @@
 </pre>
-<p>We render the scene. The <code><!--<linkto "phong">phong</linkto>--->[[Documentation:Reference Section 5.1#Phong Highlights|phong]]</code> keyword adds a highlight the
+<p>We render the scene. The <code><!--<linkto "phong">phong</linkto>--->[[Reference:Finish#Phong Highlights|phong]]</code> keyword adds a highlight the same color of the light shining on the object. It adds a lot of credibility to the picture and makes the object look smooth and shiny. Lower values of phong will make the highlight less bright (values should be between 0 and 1).</p>
 <!--<wikinav>--->
 <br>

@@ Line 8: / Line 8: @@
 <!--</wikitalk>--->
 <!--REMOVE--->===CSG Objects===<!--THIS--->
 {{#indexentry:Intersection, CSG}}
 {{#indexentry:intersection, tutorial}}
 <p>Now let's use these same spheres to illustrate the <code>intersection</code> CSG
 object. We change the word <code>union</code> to <code>intersection</code> and
@@ Line 32: / Line 32: @@
 differences.</p>
 {{#indexentry:Difference, CSG}}
 {{#indexentry:difference, tutorial}}
 <p>We rotate the lens-shaped intersection about the y-axis so that the broad
 side is facing the camera.</p>
@@ Line 130: / Line 130: @@
 <p>We render the file again. This looks pretty good... only... we can see
 parts of each of the lens objects inside the union! This is not good.</p>
 {{#indexentry:Merge, CSG}}
 {{#indexentry:merge, tutorial}}
 <p>This brings us to the fourth kind of CSG object, the <code>merge</code>.
 Merges are the same as unions, but the geometry of the objects in the CSG
@@ Line 148: / Line 148: @@
 <p>Sure enough, it does!</p>
 ====CSG Pitfalls====
 <p>There is a severe pitfall in the CSG code that we have to be aware of.</p>
 =====Co-incident Surfaces=====
 <p>POV-Ray uses inside/outside tests to determine the points at which a ray
 intersects a CSG object. A problem arises when the surfaces of two different
@@ Line 193: / Line 193: @@
 some of the involved objects.</p>
 {{#indexentry:Light Source, the}}
 {{#indexentry:light_source, tutorial}}
 <p>In any ray-traced scene, the light needed to illuminate our objects and
 their surfaces must come from a light source. There are many kinds of light
@@ Line 201: / Line 201: @@
 very impressive results. Let's take a moment to explore some of the
 different kinds of light sources and their various parameters.</p>
 ====The Pointlight Source====
 <p>Pointlights are exactly what the name indicates. A pointlight has no size,
 is invisible and illuminates everything in the scene equally no matter how
@@ Line 279: / Line 279: @@
 illuminated evenly all the way to the horizon. This allows us to see the
 plane, but it is not very realistic.</p>
 {{#indexentry:Spotlight Source, the}}
 {{#indexentry:light_source, spotlight, tutorial}}
 <p>Spotlights are a very useful type of light source. They can be used to add
 highlights and illuminate features much as a photographer uses spots to do
@@ Line 348: / Line 348: @@
 balance.</p>
 {{#indexentry:Cylindrical Light Source, the}}
 {{#indexentry:light_source, cylinder, tutorial}}
 <p>Spotlights are cone shaped, meaning that their effect will change with
 distance. The farther away from the spotlight an object is, the larger the
@@ Line 366: / Line 366: @@
 to do the job. We try a radius of 20 and a falloff of 30 for all three
 lights. That's the ticket!</p>
 {{#indexentry:Area Light Source, the}}
 {{#indexentry:light_source, area_light, tutorial}}
 <p>So far all of our light sources have one thing in common. They produce
 sharp shadows. This is because the actual light source is a point that is
@@ Line 465: / Line 465: @@
 shadows have small, tight umbrae, just the sort we would expect to find on an
 object under a real spotlight.</p>
 ====The Ambient Light Source====
 <p>The <em>ambient light source</em> is used to simulate the effect of
 inter-diffuse reflection. If there was not inter-diffuse reflection all
@@ Line 486: / Line 486: @@
 </pre>
 <p>See [[Documentation:Reference Section 3.1#Ambient_Light|Ambient Light]] for more details.</p>
 ====Light Source Specials====
 {{#indexentry:Shadowless Lights, using}}
 {{#indexentry:light_source, shadowless, tutorial}}
 <p>Light sources can be assigned the <code>shadowless</code> keyword and no
 shadows will be cast due to its presence in a scene. Sometimes, scenes are
@@ Line 514: / Line 514: @@
 give a dim illumination to all objects including the plane in the background.
 We render it and see.</p>
 {{#indexentry:Light Source, assigning an object to|Object Lights}}
 {{#indexentry:light_source, looks_like, tutorial}}
 <p>Light sources are invisible. They are just a location where the light
 appears to be coming from. They have no true size or shape. If we want our
@@ Line 581: / Line 581: @@
 not affected in any way by the light source. The bulb must be illuminated by
 some other light source or by, as in this case, a high ambient value.</p>
 {{#indexentry:Light Fading, using|Fading Light}}
 {{#indexentry:light_source, fade_power, tutorial}}
 <p>If it is realism we want, it is not realistic for the plane to be evenly
 illuminated off into the distance. In real life, light gets scattered as it
@@ Line 614: / Line 614: @@
 distance of 10. Again, this works well. The falloff is much faster with a
 fade power of 2 so we had to raise the fade distance to 10.</p>
 ===Simple Texture Options===
 <p>The pictures rendered so far where somewhat boring regarding the
 appearance of the objects. Let's add some fancy features to the

← Older revision	Revision as of 11:59, 1 July 2012
(No difference)

@@ Line 169: / Line 169: @@
 </pre>
-<p class="Note"><strong>Note:</strong> that the vectors -1 and 1 in the box definition expand to
+<p class="Note"><strong>Note:</strong> The vectors -1 and 1 in the box definition expand to
 &lt;-1,-1,-1&gt; and &lt;1,1,1&gt; respectively.</p>
@@ Line 479: / Line 479: @@
 ambient values in every finish only the ambient light source is modified. By
 assigning different colors we can create nice effects like a moody reddish
-ambient lighting. For more details about the ambient light source see
+ambient lighting.</p>
 <p>
 Below is an example of a red ambient light source.</p>
@@ Line 486: / Line 485: @@
    global_settings { ambient_light rgb&lt;1, 0, 0&gt; }
 </pre>
 ====Light Source Specials====
 <!--<indexentry "Light Sources, special">--->

@@ Line 7: / Line 7: @@
 <br>
 <!--</wikitalk>--->
 ====CSG Intersection====
 <!--<indexentry "Intersection, CSG">--->