Reference:Lemon - Revision history

Jr: added categories.

2025-05-11T13:03:10Z

added categories.

Jholsenback: version changes

2017-06-26T10:35:20Z

version changes

Jholsenback: corrected syntax diagram issue

2016-11-17T22:46:49Z

corrected syntax diagram issue

Jholsenback: clarification

2016-09-19T13:10:49Z

clarification

Jholsenback: updated image and example code

2016-09-19T00:52:44Z

updated image and example code

Jholsenback: moved/updated note back to original position

2016-09-17T14:12:28Z

moved/updated note back to original position

Jholsenback: minor layout change

2016-09-17T13:21:59Z

minor layout change

Jholsenback: minor layout changes

2016-09-17T12:54:39Z

minor layout changes

Jholsenback: suggested changes

2016-09-17T12:34:32Z

suggested changes

Jholsenback: more grammar corrections

2016-09-16T15:07:52Z

more grammar corrections

← Older revision		Revision as of 13:03, 11 May 2025
Line 1:		Line 1:
		+	[[Category:Objects]]
		+	[[Category:Finite Solid Primitives]]
	{{#indexentry:lemon, keyword}}		{{#indexentry:lemon, keyword}}
	{{#indexentry:keyword, lemon}}		{{#indexentry:keyword, lemon}}

@@ Line 4: / Line 4: @@
 <tr>
    <td>
-     <p>{{New}} to version 3.7.1 the <code>lemon</code> object has been added. It is similar to the <code>cone</code> in that it's basically described the same way but with these differences:</p>
+     <p>{{New}} to version 3.8 the <code>lemon</code> object has been added. It is similar to the <code>cone</code> in that it's basically described the same way but with these differences:</p>
      <ul>
        <li>end points are connected along their axis via the revolution surface that's generated by the circular arc of the <em>Inner_Radius</em></li>
@@ Line 40: / Line 40: @@
 <p>The following example produced the above image:</p>
 <pre>
-#version 3.7.1;
+#version 3.8;
 global_settings { assumed_gamma 1.0 }

@@ Line 29: / Line 29: @@
 <pre>
 lemon {
-     <Base_Point>, Base_Radius, <Cap_Point>, Cap_Radius, Inner_Radius
+     &lt;Base_Point&gt;, Base_Radius, &lt;Cap_Point&gt;, Cap_Radius, Inner_Radius
      [LEMON_MODIFIERS]
+   }

@@ Line 7: / Line 7: @@
      <ul>
        <li>end points are connected along their axis via the revolution surface that's generated by the circular arc of the <em>Inner_Radius</em></li>
-       <li>minimal <em>Inner_Radius</em> is a spherical segment where the center of the arc lies on the end points axis</li>
+       <li>for the minimal value of <em>Inner_Radius</em> the surface is a spherical segment where the center of the arc lies along the end points axis</li>
        <li>with larger values for <em>Inner_Radius</em> the surface is the inner part of a self intersecting torus or [https://en.wikipedia.org/wiki/Frustum frustum]</li>
        <li>if the given <em>Inner_Radius</em> is too small the minimal value is used instead and a warning is issued</li>

@@ Line 14: / Line 14: @@
    </td>
    <td>
-     [[Image:LeForgeronLemon.png|center|220px<!--centered--->]]
+     [[Image:RefImgLemon.png|center|220px<!--centered--->]]
    </td>
 </tr>
@@ Line 43: / Line 43: @@
 global_settings { assumed_gamma 1.0 }
-camera { location -560*z
+camera {
-         direction z
+  location -560*z
-         up y
+  direction z
-         right image_width*x/image_height
+  up y
-         angle 5
+  rotate x*20
+  right image_width*x/image_height
 #include "colors.inc"
-lemon { -18*y-10*x, 0, 18*y-10*x, 0, 30 texture { pigment { color CH2RGB(30) filter 0.45 } } }
+#macro LightSource (LightColor)
-lemon { +10*x+1*y, 5, 18*y+10*x, 0, 15 texture { pigment { color CH2RGB(100) filter 0.45 } } }
+  light_source { <0,0,-200>, LightColor area_light x*15, z*15 20,20 adaptive 1 jitter orient circular }
-lemon { -1*y+10*x, 5, -18*y+10*x, 5, 15 texture { pigment { color CH2RGB(150) filter 0.45 } } }
+#end
-box { 10*z-20*x-20*y, 10*z+20*x+20*y texture { pigment { color White }}}
+background { White }
-light_source { 10*<0,0,-20>, 0.9 }
+object { LightSource (1.0) rotate x*40 }
-light_source { 10*<-5,10,-50>, 0.9 }
+object { LightSource (0.8) rotate x*-40 rotate y*330 }
-light_source { 10*<-10,10,-50>, 0.9 }
+object { LightSource (1.2) rotate x*80 rotate y*210 }
-light_source { 10*<5,10,-50>, 0.9 }
-light_source { 10*<10,10,-50>, 0.9 }
+lemon { <0,-20,0>, 0, <0,20,0>, 0, 30
 </pre>
 <p>If additional accuracy is required you can add the <code>[[Reference:Sturm Object Modifier|sturm]]</code> object modifier.</p>
 <p>See also the <code>[[Reference:Cone|cone]]</code> object.</p>

@@ Line 25: / Line 25: @@
 </tr>
 </table>
 <p>The syntax is as follows:</p>
 <pre>
 lemon {

@@ Line 6: / Line 6: @@
      <p>{{New}} to version 3.7.1 the <code>lemon</code> object has been added. It is similar to the <code>cone</code> in that it's basically described the same way but with these differences:</p>
      <ul>
-       <li>end points are connected by a spherically curved <em>Inner_Radius</em></li>
+       <li>end points are connected along their axis via the revolution surface that's generated by the circular arc of the <em>Inner_Radius</em></li>
-       <li>generally speaking <em>Inner_Radius</em> <strong>must be</strong> greater than or equal to half the distance between end points</li>
+       <li>minimal <em>Inner_Radius</em> is a spherical segment where the center of the arc lies on the end points axis</li>
        <li>minimal <em>Inner_Radius</em> is defined as sqrt (radius<sup>2</sup> + (distance/2)<sup>2</sup>)</li>
        <li><em>both</em> or <em>either</em> of the end points radii can be zero</li>
      </ul>
    </td>
    <td>
-     [[Image:LeForgeronLemon.png|center|240px<!--centered--->]]
+     [[Image:LeForgeronLemon.png|center|215px<!--centered--->]]
    </td>
 </tr>

@@ Line 11: / Line 11: @@
        <li>if the given <em>Inner_Radius</em> is too small the minimal value as defined above is used instead and a warning is issued</li>
        <li><em>both</em> or <em>either</em> of the end points radii can be zero</li>
-       <li>coded constraints on minimal <em>Inner_Radius</em> and when end points radii are different can have adverse consequences</li>
+       <li>coded constraints on minimal <em>Inner_Radius</em> or when the end points radii are different can have adverse consequences</li>
      </ul>
    </td>