pixelated.ashimag.com

pixelated.glsl.ashimag.com

Advanced GLSL: Ambient Occlusion

http://pixelated.glsl.ashimag.com/p/ambient-occlusion.html

I used SSAO technique to implement ambient occlusion in sponza scene. I created 16 random samples and calculated occlusion based on the following assumptions:. 1 If the occluder point lies in the same plane as the occludee then, occlusion is 0. 2 If the occluder is below the occludee then again the occlusion is 0. 3 Also, the occlusion varies with occluder's distance from occludee. With out ambient occlusion. Result with Tea pot:. Subscribe to: Posts (Atom).

pixelated.cuda.ashimag.com

CUDA Projects: Ray Trace - Shadows

http://pixelated.cuda.ashimag.com/2012/09/shadows.html

Ray Trace - Shadows. Shadow implementation process in Ray tracer:. To generate shadows, we need to traverse all the light sources and find if there is any object between currently intersected object and the light. If, there is an object then the object is in shadow and we do not need to calculate the color of that pixel. Bool inshadow = false;. For(int i = 0 ;i numberoflights; i ){. LightDirection =normalise( light[i] - intersectionPoint);. LightOrigin = intersectionPoint;. LightDist = 100000.0f;.

pixelated.webgl.ashimag.com

WebGL projects: Fresnel equations & subsurface scattering

http://pixelated.webgl.ashimag.com/2012/12/fresnel-refractionreflection-subsurface.html

Fresnel equations and subsurface scattering. Fresnel equations describe the reflection and transmission of rays through an object. In essence, when the rays reach the boundaryof two different objects then the part of the ray is reflected and part is refracted. I used russian roullette technique which determines either to refract or reflect based on the fresnel transmission coefficient. The working example can be seen at: Fresnel example. The results are as follows:. Subscribe to: Post Comments (Atom).

pixelated.cuda.ashimag.com

CUDA Projects: Ray Trace - Reflection & Refraction

http://pixelated.cuda.ashimag.com/2012/09/reflection-refraction.html

Ray Trace - Reflection and Refraction. Refraction: Working to correct black dots in the image. Subscribe to: Post Comments (Atom). Picture Window template. Template images by Airyelf.

pixelated.webgl.ashimag.com

WebGL projects: Color accumulation & refraction/reflection

http://pixelated.webgl.ashimag.com/2012/12/accumulated-colors-properly.html

Color accumulation and refraction/reflection. Finally I got the color accumulation working. The color is accumulated by creating two textures. For the final color in the scene we access the colors from the texture and then render the final color to the texture. That way, we are constantly accessing textures from the previous frame and updating the texture in current frame with the final color. The technique which I described in my CUDA path tracer blog post. Subscribe to: Post Comments (Atom).

blog.virtualglobebook.com

Virtual Globe and Terrain Rendering: Reflections on Teaching GPU Programming and Architecture: Take III

http://blog.virtualglobebook.com/2013/04/reflections-on-teaching-gpu-programming.html

Wednesday, April 10, 2013. Reflections on Teaching GPU Programming and Architecture: Take III. I've taught CIS 565: GPU Programming and Architecture. At the University of Pennsylvania. Three times now, and every time I like to write a reflections post on what went well and what didn't. This semester I made some pretty unconventional changes. No Written Homework. No Tests. No Final. CUDA path tracer - Aparajith Sairam. All written in CUDA. Tessellation shaders - Tiju Thomas. To discourage cheating, the ac...

pixelated.phys.ashimag.com

Physically Based Animation: About:

http://pixelated.phys.ashimag.com/2012/12/about.html

This page is dedicated to the projects I have implemented as a part of physically based animation. The list of projects implemented:. Particle based fluid simulation (SPH). Subscribe to: Post Comments (Atom). Picture Window template. Template images by Airyelf.

pixelated.glsl.ashimag.com

Advanced GLSL: Image post-processing

http://pixelated.glsl.ashimag.com/p/image-post-processing.html

Implemented various image effects using fragment shader. 1 Image Negative: The formula is very simple just deduct the rgb values of image from 1 i.e. 1 - rgb is the new color of the image. 2 Grey Scale: Greyscale image is an image in which the value of each pixel contains only the intensity of color at that pixel. Hence, the formula to calculate intensity is:. Vec3 W = vec3 (0.2125, 0.7154, 0.0721);. Float luminance = dot(rgb, W);. Then, just set the luminance value to be the rgb value for the pixel.

pixelated.glsl.ashimag.com

Advanced GLSL: Globe Rendering

http://pixelated.glsl.ashimag.com/p/globe-rendering.html

I implemented the following feature as a part of image processing in fragment shader:. Bump mapped terrain using height maps. Rim lighting to simulate atmosphere. Nighttime lights on the dark side of the globe. Specular mapping using specular maps. Moving clouds using textures and transparency maps. Height map shading by changing the color of the terrain based on the height of the terrain using height map. Subscribe to: Posts (Atom). Picture Window template. Template images by Airyelf.