Book 3 figure captions

RayTracing · Nov 2, 2019 · 89a23df · 89a23df
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diff --git a/books/RayTracingTheRestOfYourLife.html b/books/RayTracingTheRestOfYourLife.html
@@ -55,7 +55,7 @@
 problem being a classic case study. We’ll do a variation inspired by that. Suppose you have a circle
 inscribed inside a square:
 
-  ![Figure 2-1](../images/fig-3-02-1.jpg)
+  ![Figure [circ-sq]: Estimating π with a circle inside a square](../images/fig.circ-sq.jpg)
 
 </div>
 
@@ -132,7 +132,7 @@
 We can mitigate this diminishing return by *stratifying* the samples (often called *jittering*),
 where instead of taking random samples, we take a grid and take one sample within each:
 
-  ![Figure 2-2](../images/fig-3-02-2.jpg)
+  ![Figure [jitter]: Sampling areas with jittered points](../images/fig.jitter.jpg)
 
 </div>
 
@@ -251,7 +251,7 @@
 First, what is a _density function_? It’s just a continuous form of a histogram. Here’s an example
 from the histogram Wikipedia page:
 
-  ![Figure 3-1](../images/fig-3-03-1.jpg)
+  ![Figure [histogram]: Histogram example](../images/fig.histogram.jpg)
 
 </div>
 
@@ -281,7 +281,7 @@
 between 0 and 2 whose probability is proportional to itself: $r$. We would expect the pdf $p(r)$
 to look something like the figure below. But how high should it be?
 
-  ![Figure 3-2](../images/fig-3-03-2.jpg)
+  ![Figure [linear-pdf]: A linear PDF](../images/fig.linear-pdf.jpg)
 
 <div class='together'>
 The height is just $p(2)$. What should that be? We could reasonably make it anything by
@@ -589,7 +589,7 @@
 goes through. The solid angle $\omega$ and the projected area $A$ on the unit sphere are the same
 thing.
 
-  ![Figure 4-1](../images/fig-3-04-1.jpg)
+  ![Figure [solid-angle]: Solid angle / projected area of a sphere](../images/fig.solid-angle.jpg)
 
 Now let’s go on to the light transport equation we are solving.
 
@@ -979,7 +979,7 @@
 <div class='together'>
 And plot them for free on plot.ly (a great site with 3D scatterplot support):
 
-  ![Image 7-1](../images/fig-3-07-1.jpg)
+  ![Figure [pt-uni-sphere]: Random points on the unit sphere](../images/fig.pt-uni-sphere.jpg)
 
 </div>
 
@@ -1229,7 +1229,7 @@
 $1/A$. But what is it on the area of the unit sphere that defines directions? Fortunately, there is
 a simple correspondence, as outlined in the diagram:
 
-  ![Figure 9-1](../images/fig-3-09-1.jpg)
+  ![Figure [light-pdf]: Projection of light shape onto PDF](../images/fig.light-pdf.jpg)
 
 </div>
 
@@ -1969,7 +1969,7 @@
 <div class='together'>
 Now what is $\theta_{max}$?
 
-  ![Figure 12-1](../images/fig-3-12-1.jpg)
+  ![Figure [sphere-cone]: A sphere enclosing cone](../images/fig.sphere-cone.jpg)
 
 </div>
 

diff --git a/images/fig-3-02-1.jpg → images/fig.circ-sq.jpg b/images/fig-3-02-1.jpg → images/fig.circ-sq.jpg
diff --git a/images/fig-3-03-1.jpg → images/fig.histogram.jpg b/images/fig-3-03-1.jpg → images/fig.histogram.jpg
diff --git a/images/fig-3-02-2.jpg → images/fig.jitter.jpg b/images/fig-3-02-2.jpg → images/fig.jitter.jpg
diff --git a/images/fig-3-09-1.jpg → images/fig.light-pdf.jpg b/images/fig-3-09-1.jpg → images/fig.light-pdf.jpg
diff --git a/images/fig-3-03-2.jpg → images/fig.linear-pdf.jpg b/images/fig-3-03-2.jpg → images/fig.linear-pdf.jpg
diff --git a/images/fig-3-07-1.jpg → images/fig.pt-uni-sphere.jpg b/images/fig-3-07-1.jpg → images/fig.pt-uni-sphere.jpg
diff --git a/images/fig-3-04-1.jpg → images/fig.solid-angle.jpg b/images/fig-3-04-1.jpg → images/fig.solid-angle.jpg
diff --git a/images/fig-3-12-1.jpg → images/fig.sphere-cone.jpg b/images/fig-3-12-1.jpg → images/fig.sphere-cone.jpg