University of British Columbia Assignments Office Hours Graded Work CPSC 314 Computer Graphics • project • extra TA office hours in lab 005 for P4/H4 • still have some marked work not picked up, Jan-Apr 2010 • P4 due today 5pm (plus grace/late days) come grab it! • Wed 4/14 2-4, 5-7 (Shailen) • project 4 demo signup sheet, for last time • Thu 4/15 3-5 (Kai) • homeworks, midterms Tamara Munzner • I will scan and post so you can check your time • Fri 4/16 11-4 (Garrett) • you must contact me by Fri to schedule if you weren't in class to • some extra handouts in lab sign up • my office hours for rest of term • or print out yourself, everything posted on • otherwise 2% huntdown penalty • Fri 4/16 4pm • email me in advance if you need to change web site Nonspatial/Information Visualization II • by appointment - send me email to book • otherwise 2% noshow penalty • homework • (I'm out of town 4/24-4/27, right after exam) • H4 solutions released Friday • don't forget to check ugrad account for Week 13, Wed Apr 14 • homeworks not accepted after Thu 5pm grading updates • again: if you hand in late, do include time/date at top • find out what you got • H4 will be graded before exam http://www.ugrad.cs.ubc.ca/~cs314/Vjan2010 • stay tuned, I'll announce on discussion group when they're ready • also cross-check our records against yours to pick up 2 3 4 Final Exam Final Emphasis Exam Prep Grading Reminder • Apr 23 8:30-11:30am, location DMP 310 • covers entire course • advanced rendering • another sample final just posted • Original grading scheme for course • clipping • includes material from • across the hall • from Jan 2007 • 20% midterm and 25% final midterm • hidden surfaces • exam will be 2.5 hrs • homeworks are good practice • New grading scheme for course • blending • transformations • extra 30 min in case of fire alarms, etc • viewing • textures • especially old homeworks from when I taught • 12% midterm and 33% final • closed book • more than half of exam • procedural the course • one page notes, 8.5"x11", handwritten will be on material not approaches • Your course grade will automatically be the • both sides allowed, fine to reuse one side from covered in midterm • picking midterm max of new and old schemes. • color • collision • antialiasing • calculator is a good idea • rasterization • lighting/shading • modern hardware • IDs out and face up • curves • bags/coats in front - phones off! • visualization 5 6 7 8 week9.day3, slide 8 week6.day1, slide 29.5 week6.day1, slide 30 week6.day1, slide 31 Correction: Premultiplying Colors Clarification: Midpoint Check Clarification: Making It Incremental Clarification/Correction: Integer Only • specify opacity with alpha channel: (r,g,b, α ) • f(x,y) = (y 0 - y 1 ) x + (x 1 - x 0 ) y + x 0 y 1+ x 1 y 0 • d: midpoint. build off previous computation • avoid dealing with non-integer values by doubling both sides • α =1: opaque, α =.5: translucent, α =0: transparent • implicit equation: on line when f(x,y) = 0 • if we stayed at same level, midpoint above line (d<0) • from f(x,y) = 0 to 2f(x,y) = 0 • above line when f(x,y) < 0 • A over B • new midpoint check to set up is f(x+1, y) = f(x,y) + (y 0 -y 1 ) • f(x,y) = (y 0 - y 1 ) x + (x 1 - x 0 ) y + x 0 y 1+ x 1 y 0 • C = α A + (1- α ) B • below line when f(x,y) > 0 • if we moved up one level, midpoint below line (d>0) y=y0 • check midpoint against line y=y0 2 d = 2*(y0-y1)(x0+1) + • new midpoint check set up is f(x+1, y+1) = f(x,y) + (y 0 - y 1 ) + (x 1 - x 0 ) • but what if B is also partially transparent ? d = f(x0+1, y0+.5) (x1-x0)(2*y0+1) + • C = α A + (1- α ) β B = β B + α A + β B - α β B • midpoint to check is at x+1, y+.5 2*x0y1 - 2*x1y0 for (x=x0; x <= x1; x++) • γ = β + (1- β ) α = β + α – αβ • if f(x+1, y+5) < 0 then midpoint is below line { for (x=x0; x <= x1; x++) { midpoint above: bottom pixel • 3 multiplies, different equations for alpha vs. RGB y=y0 draw(x,y); draw(x,y); d = f(x0+1, y0+.5) y=y0 • premultiplying by alpha if (d<0) then { if (d<0) then { for (x=x0; x <= x1; x++) { for (x=x0; x <= x1; x++) { • C’ = γ C, B’ = β B, A’ = α A draw(x,y); y = y + 1; y = y + 1; draw(x,y); if (d<0) then { d = d + (x1 - x0) + d = d + 2(x1 - x0) + • C’ = B’ + A’ - α B’ if (f(x+1, y+.5) < 0) then { y = y + 1; (y0 - y1) 2(y0 - y1) midpoint below: top pixel • γ = β + α – αβ d = d + (x1 - x0) + (y0 - y1) y = y + 1; } else { } else { • 1 multiply to find C, same equations for alpha and RGB } else { } d = d + (y0 - y1) d = d + 2(y0 - y1) d = d + (y0 - y1) } } 9 10 11 12 } Evaluations - Right Now Review: Direct Volume Rendering Review: Visual Encoding Review: Channel Ranking By Data Type marks: geometric primitives • official TA evaluations points lines areas attributes • still on paper, not online yet • unofficial course evaluations - my custom form Classify position • attributes • much more specific questions than the official ones • parameters size • I do not look at these until after official ones returned, long control mark after grades are out appearance Shade • if you missed class, blanks will be in extra handouts container grey level • separable in lab, can turn in anonymously to the front desk on 2 nd floor channels • your feedback helps me improve the course in later years texture flowing from Interpolate retina to brain color • please also fill out official teaching surveys for instructor (me!) at the CoursEval website orientation https://eval.olt.ubc.ca/science Composite shape [Mackinlay, Automating the Design of Graphical Presentations of Relational Information, ACM 13 14 Semiology of Graphics. Jacques Bertin, Gauthier-Villars 1967, EHESS 1998 15 16 TOG 5:2, 1986]
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