Update README.md

Author: José Villegas

README.md

@@ -243,6 +243,14 @@ S1 | 1.03 ms | 7.27 ms | 7.67 ms | 17.81 ms |
 S2 | 1.32 ms | 7.62 ms | 8.32 ms | 17.60 ms |
 S3 | 1.34 ms | 7.81 ms | 8.41 ms | 16.97 ms |
 
+## Comparison
+
+Below a visual comparison between a reference image rendered in a path-tracer for 3 hours, another real time global illumination technique called [light propagation volumes](http://www.crytek.com/download/Light_Propagation_Volumes.pdf) and my technique. The image generated by my technique is closer to the reference image, specially the indirect diffuse reaching the right columns that aren't directly hit by the light source. Light propagation volumes is also limited in the sense that it only provides approximation for the indirect diffuse term, whereas voxel cone tracing achieves specular reflection and many other light phenomena.
+
+| Reference (3~ hours) | [Light Propagation Volumes](http://www.crytek.com/download/Light_Propagation_Volumes.pdf) (18.86 ms) | My approach (17.34 ms) |
+|:------:|:------:|:------:|
+<img src="http://res.cloudinary.com/jose-villegas/image/upload/v1497758681/DVSGI/reference.png" style="width: 100%;"/>|<img src="http://res.cloudinary.com/jose-villegas/image/upload/v1497758675/DVSGI/lpv_comp.png" style="width: 100%;"/>|<img src="https://res.cloudinary.com/jose-villegas/image/upload/v1497758664/DVSGI/sponza_comp.png" style="width: 100%;"/>
+
 ### Optimizations
 
 In my implementation the dynamic update can be set to update at a given number of frames or on demand, a simple optimization for example is to update each 5~3 frames, this can easily give results over 60FPS for most scenes with little to zero notable difference.
@@ -281,12 +289,6 @@ One optimization to consider that wasn't implemented in my application is to sep
 |:------:|:------:|:------:|:------:|
 <img src="https://res.cloudinary.com/jose-villegas/image/upload/v1497758213/DVSGI/shadow_1.png" style="width: 100%;"/>|<img src="https://res.cloudinary.com/jose-villegas/image/upload/v1497758213/DVSGI/shadow_5.png" style="width: 100%;"/>|<img src="https://res.cloudinary.com/jose-villegas/image/upload/v1497758213/DVSGI/shadow_10.png" style="width: 100%;"/>|<img src="https://res.cloudinary.com/jose-villegas/image/upload/v1497758213/DVSGI/shadow_25.png" style="width: 100%;"/>
 
-### Comparison
-
-| Reference (3~ hours) | [LPV](http://www.crytek.com/download/Light_Propagation_Volumes.pdf) (18.86 ms) | My approach (17.34 ms) |
-|:------:|:------:|:------:|
-<img src="http://res.cloudinary.com/jose-villegas/image/upload/v1497758681/DVSGI/reference.png" style="width: 100%;"/>|<img src="http://res.cloudinary.com/jose-villegas/image/upload/v1497758675/DVSGI/lpv_comp.png" style="width: 100%;"/>|<img src="https://res.cloudinary.com/jose-villegas/image/upload/v1497758664/DVSGI/sponza_comp.png" style="width: 100%;"/>
-
 ### Emissive Materials / Area Lights
 
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