Project 3: Szeyu Chan

CMakeLists.txt

@@ -73,6 +73,7 @@ set(headers
     src/sceneStructs.h
     src/preview.h
     src/utilities.h
+    src/tinyobj/tiny_obj_loader.h
     )
 
 set(sources
@@ -84,6 +85,7 @@ set(sources
     src/scene.cpp
     src/preview.cpp
     src/utilities.cpp
+    src/tinyobj/tiny_obj_loader.cc
     )
 
 list(SORT headers)

README.md

@@ -3,11 +3,50 @@ CUDA Path Tracer
 
 **University of Pennsylvania, CIS 565: GPU Programming and Architecture, Project 3**
 
-* (TODO) YOUR NAME HERE
-* Tested on: (TODO) Windows 22, i7-2222 @ 2.22GHz 22GB, GTX 222 222MB (Moore 2222 Lab)
+* Szeyu Chan
+  * [LinkedIn](https://www.linkedin.com/in/szeyuchan11/)
+* Tested on: Windows 10, i7-10510U @ 1.80GHz 16GB, MX250 2048MB (Personal Laptop)
 
-### (TODO: Your README)
+### Features
+* A shading kernel with BSDF evaluation for:
+  * Ideal Diffuse surfaces
+  * Perfectly specular-reflective (mirrored) surfaces
+* Path continuation/termination using Stream Compaction (thrust::partition)
+* Sorting rays/pathSegments/intersections contiguous in memory by material type (thrust::sort_by_key)
+* The first bounce intersections cache for re-use across all subsequent iterations
+* Refraction with Frensel effects using Schlick's approximation
+* Physically-based depth-of-field
+* OBJ mesh loader
 
-*DO NOT* leave the README to the last minute! It is a crucial part of the
-project, and we will not be able to grade you without a good README.
+### Results
+#### Specular Sphere
+![](./results/cornell_part1.png)
 
+#### Glass Sphere (IOR = 1.5)
+![](./results/glassball.png)
+
+#### Depth of Field
+| Focal distance = 11.5 | Focal Distance = 8.5|
+| :----:  | :----: |
+|![](./results/dof1.png)|![](./results/dof2.png)|
+
+#### cube.obj
+![](./results/cube.png)
+
+### Performance Analysis
+
+#### Stream Compaction and Material Sorting
+![](./results/stream_sort.png)
+
+I tested the runtime for 50 iterations with different max ray depths.  
+For stream compaction (compared the blue bars and the orange bars), it can save runtime especially with a higher max ray depth, because it can terminate the useless rays in advance.  
+For material sorting (compared the blue bars and the gray bars), although it can sort the rays based on materials to reduce divergence, it costs much time in this Cornell box scene. My assumption is because there are few materials and objects in this scene, the overhead of sorting is not negligible.
+
+### Third-Party Code
+* [tinyObj](https://github.com/syoyo/tinyobjloader)
+* [My CPU-based path tracer](https://github.com/CIS-461-2020/final-project-AsteriskChan)
+  *  Triangle intersection 
+  *  Depth of field with disk sampling
+
+### Reference
+* [PBRT] Physically Based Rendering, Second Edition: From Theory To Implementation. Pharr, Matt and Humphreys, Greg. 2010.

scenes/cornell2.txt

@@ -0,0 +1,125 @@
+// Emissive material (light)
+MATERIAL 0
+RGB         1 1 1
+SPECEX      0
+SPECRGB     0 0 0
+REFL        0
+REFR        0
+REFRIOR     0
+EMITTANCE   5
+
+// Diffuse white
+MATERIAL 1
+RGB         .98 .98 .98
+SPECEX      0
+SPECRGB     0 0 0
+REFL        0
+REFR        0
+REFRIOR     0
+EMITTANCE   0
+
+// Diffuse red
+MATERIAL 2
+RGB         .85 .35 .35
+SPECEX      0
+SPECRGB     0 0 0
+REFL        0
+REFR        0
+REFRIOR     0
+EMITTANCE   0
+
+// Diffuse green
+MATERIAL 3
+RGB         .35 .85 .35
+SPECEX      0
+SPECRGB     0 0 0
+REFL        0
+REFR        0
+REFRIOR     0
+EMITTANCE   0
+
+// Specular white
+MATERIAL 4
+RGB         .98 .98 .98
+SPECEX      0
+SPECRGB     .98 .98 .98
+REFL        1
+REFR        0
+REFRIOR     0
+EMITTANCE   0
+
+// Camera
+CAMERA
+RES         800 800
+FOVY        45
+ITERATIONS  5000
+DEPTH       8
+FILE        cornell
+EYE         0.0 5 10.5
+LOOKAT      0 5 0
+UP          0 1 0
+
+
+// Ceiling light
+OBJECT 0
+cube
+material 0
+TRANS       0 10 0
+ROTAT       0 0 0
+SCALE       3 .3 3
+
+// Floor
+OBJECT 1
+cube
+material 1
+TRANS       0 0 0
+ROTAT       0 0 0
+SCALE       10 .01 10
+
+// Ceiling
+OBJECT 2
+cube
+material 1
+TRANS       0 10 0
+ROTAT       0 0 90
+SCALE       .01 10 10
+
+// Back wall
+OBJECT 3
+cube
+material 1
+TRANS       0 5 -5
+ROTAT       0 90 0
+SCALE       .01 10 10
+
+// Left wall
+OBJECT 4
+cube
+material 2
+TRANS       -5 5 0
+ROTAT       0 0 0
+SCALE       .01 10 10
+
+// Right wall
+OBJECT 5
+cube
+material 3
+TRANS       5 5 0
+ROTAT       0 0 0
+SCALE       .01 10 10
+
+// Sphere
+OBJECT 6
+sphere
+material 1
+TRANS       -1 4 -1
+ROTAT       0 0 0
+SCALE       3 3 3
+
+// Sphere
+OBJECT 7
+sphere
+material 1
+TRANS       1 2 2
+ROTAT       0 0 0
+SCALE       3 3 3

scenes/cornellGlass.txt

@@ -0,0 +1,128 @@
+// Emissive material (light)
+MATERIAL 0
+RGB         1 1 1
+SPECEX      0
+SPECRGB     0 0 0
+REFL        0
+REFR        0
+REFRIOR     0
+EMITTANCE   5
+
+// Diffuse white
+MATERIAL 1
+RGB         .98 .98 .98
+SPECEX      0
+SPECRGB     0 0 0
+REFL        0
+REFR        0
+REFRIOR     0
+EMITTANCE   0
+
+// Diffuse red
+MATERIAL 2
+RGB         .85 .35 .35
+SPECEX      0
+SPECRGB     0 0 0
+REFL        0
+REFR        0
+REFRIOR     0
+EMITTANCE   0
+
+// Diffuse green
+MATERIAL 3
+RGB         .35 .85 .35
+SPECEX      0
+SPECRGB     0 0 0
+REFL        0
+REFR        0
+REFRIOR     0
+EMITTANCE   0
+
+// Specular white
+MATERIAL 4
+RGB         .98 .98 .98
+SPECEX      0
+SPECRGB     .98 .98 .98
+REFL        1
+REFR        0
+REFRIOR     0
+EMITTANCE   0
+
+// Glass
+MATERIAL 5
+RGB         .68 .98 .98
+SPECEX      0
+SPECRGB     .68 .98 .98
+REFL        0
+REFR        1
+REFRIOR     1.5
+EMITTANCE   0
+
+// Camera
+CAMERA
+RES         800 800
+FOVY        45
+ITERATIONS  5000
+DEPTH       8
+FILE        cornell
+EYE         0.0 5 10.5
+LOOKAT      0 5 0
+UP          0 1 0
+
+
+// Ceiling light
+OBJECT 0
+cube
+material 0
+TRANS       0 10 0
+ROTAT       0 0 0
+SCALE       3 .3 3
+
+// Floor
+OBJECT 1
+cube
+material 1
+TRANS       0 0 0
+ROTAT       0 0 0
+SCALE       10 .01 10
+
+// Ceiling
+OBJECT 2
+cube
+material 1
+TRANS       0 10 0
+ROTAT       0 0 90
+SCALE       .01 10 10
+
+// Back wall
+OBJECT 3
+cube
+material 1
+TRANS       0 5 -5
+ROTAT       0 90 0
+SCALE       .01 10 10
+
+// Left wall
+OBJECT 4
+cube
+material 2
+TRANS       -5 5 0
+ROTAT       0 0 0
+SCALE       .01 10 10
+
+// Right wall
+OBJECT 5
+cube
+material 3
+TRANS       5 5 0
+ROTAT       0 0 0
+SCALE       .01 10 10
+
+// Sphere
+OBJECT 6
+sphere
+material 5
+TRANS       0 4 0
+ROTAT       0 0 0
+SCALE       3 3 3
+