CSC418: Computer Graphics DAVID LEVIN Todays Topics 1. Texture - PowerPoint PPT Presentation

CSC418: Computer Graphics DAVID LEVIN

Today’s Topics 1. Texture mapping 2. More Ray Tracing Some slides and figures courtesy of Wolfgang Hürst, Patricio Simari Some figures courtesy of Peter Shirley, “Fundamentals of Computer Graphics”, 3rd Ed.

Showtime https://www.youtube.com/watch?v=frLwRLS_ZR0

But First … Logistical Things • Assignment 3 available on BBS (coming soon to website)

Topic 1: Texture Mapping • Motivation • Sources of texture • Texture coordinates • {Bump, MIP, displacement, environmental} mapping

Motivation • Adding lots of detail to our models to realistically depict skin, grass, bark, stone, etc., would increase rendering times dramatically, even for hardware-supported projective methods.

Motivation • Adding lots of detail to our models to realistically depict skin, grass, bark, stone, etc., would increase rendering times dramatically, even for hardware-supported projective methods.

Motivation

Motivation

Topic 1: Texture Mapping • Motivation • Sources of texture • Texture coordinates • {Bump, MIP, displacement, environmental} mapping

Texture sources: Photographs

Texture sources: Solid textures

Texture sources: Procedural

Texture sources: Synthesized

Original Synthesized Original Synthesized

Topic 1: Texture Mapping • Motivation • Sources of texture • Texture coordinates • {Bump, MIP, displacement, environmental} mapping

Texture coordinates How does one establish correspondence? (UV mapping)

Texture coordinates

Texture coordinates

Texture coordinates

Texture coordinates

Texture coordinates

Texture coordinates

Texture coordinates

Texture coordinates

Texture coordinates

Topic 1: Texture Mapping • Motivation • Sources of texture • Texture coordinates • {Bump, MIP, displacement, environmental} mapping

Mipmapping

MIP-Mapping: Basic Idea Given a polygon, use the texture image, where the projected polygon best matches the size of the polygon on screen.

Mipmapping

Mipmapping

Environment mapping

Environment mapping

Environment mapping

Environment mapping

Bump mapping

Bump mapping

Bump mapping

Displacement mapping

Displacement mapping

Bounce Maps

Topic 2: Basic Ray Tracing • Introduction to ray tracing • Computing normals • Evaluating shading model • Computing rays • Spawning rays • Computing intersections • Incorporating transmission • refraction • ray-triangle • ray-spawning & refraction • ray-polygon • ray-quadric • the scene signature

A basic ray tracing algorithm

Shading model

Topic 3: Less Basic Ray Tracing • Introduction to ray tracing • Computing normals • Evaluating shading model • Computing rays • Spawning rays • Computing intersections • Incorporating transmission • refraction • ray-triangle • ray-spawning & refraction • ray-polygon • ray-quadric • the scene signature

local illumination reflection refraction

Modeling Reflection: Transmission

Physics of Refraction

Physics of Refraction

Geometry of Refraction

Geometry of Refraction: Transmission Vector

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