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Procedural and interactive icicle modeling Jonathan Gagnon Eric Paquette.

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Presentation on theme: "Procedural and interactive icicle modeling Jonathan Gagnon Eric Paquette."— Presentation transcript:

1 Procedural and interactive icicle modeling Jonathan Gagnon Eric Paquette

2 Icy challenges Goal – Control – Fast computation 2 J. Gagnon & E. Paquette photograph

3 Overview 1.Previous work 2.Proposed approach 3.Results 4.Limitations & Conclusion 3 J. Gagnon & E. Paquette

4 Overview 1.Previous work 2.Proposed approach 3.Results 4.Limitations & Conclusion 4 J. Gagnon & E. Paquette

5 Previous work: Frost Microdroplets Kim et al – Phase field Kim et al. 2004a – Phase field, DLA, fluid simulation – Realistic – No volume 5 J. Gagnon & E. Paquette

6 Previous work: Glaciology Makkonen 1988 – Growth vectors – Convection and conduction Maneo et al – Dentritic growth Szilder et Lozowski 1994 – Predict the form 6 J. Gagnon & E. Paquette

7 Previous work: Computer Graphics Kharitonsky et Gonczarowski 1993 – Surface tension, tendency of water drop to follow a wet path. Kim et al – Stephan problem Problems – Control – Computation time 7 J. Gagnon & E. Paquette

8 Overview 1.Previous work 2.Proposed approach 3.Results 4.Limitations & Conclusion 8 J. Gagnon & E. Paquette

9 Procedural icicle modeling 9 J. Gagnon & E. Paquette

10 Procedural icicle modeling 10 J. Gagnon & E. Paquette

11 Water Coefficients Goal – Compute the water flow Steps – Compute the water supply – Compute the water coefficient J. Gagnon & E. Paquette 11

12 Water Supply Source surface J. Gagnon & E. Paquette 12 Scatter & Ray-trace

13 Water Supply J. Gagnon & E. Paquette 13

14 Water Flow J. Gagnon & E. Paquette 14 Compute the water coefficient

15 Water Flow J. Gagnon & E. Paquette 15 Compute the water coefficient

16 Water Flow J. Gagnon & E. Paquette 16 Compute the water coefficient

17 Water Flow J. Gagnon & E. Paquette 17 Compute the water coefficient

18 Water Flow J. Gagnon & E. Paquette 18 Compute the water coefficient

19 Water Flow J. Gagnon & E. Paquette 19 Compute the water coefficient

20 Water Flow J. Gagnon & E. Paquette 20 Compute the water coefficient

21 Water Flow J. Gagnon & E. Paquette 21 Compute the water coefficient

22 Water Flow J. Gagnon & E. Paquette 22 Compute the water coefficient

23 Water Flow J. Gagnon & E. Paquette 23 Compute the water coefficient

24 Water Flow Compute the water coefficient J. Gagnon & E. Paquette 24

25 J. Gagnon & E. Paquette 25

26 Water Coefficients J. Gagnon & E. Paquette 26

27 Water Coefficients Works well with several surfaces J. Gagnon & E. Paquette 27

28 Procedural icicle modeling 28 J. Gagnon & E. Paquette

29 Drip points identification Goal – Find were the water drips Steps – Find drip region – Place drip points J. Gagnon & E. Paquette 29

30 Drip Criterion J. Gagnon & E. Paquette 30

31 Drip region J. Gagnon & E. Paquette 31

32 Drip points J. Gagnon & E. Paquette 32 Randomly distributed on the drip region

33 Procedural icicle modeling 33 J. Gagnon & E. Paquette

34 Icicles’ trajectories Goal – Create a guide for each icicle Previzualisation Interactive modification – Simulate different icicle types Straight Curved Divided J. Gagnon & E. Paquette 34

35 Icicles’ trajectories L-System J. Gagnon & E. Paquette 35

36 L-System J. Gagnon & E. Paquette 36

37 Broad range of results J. Gagnon & E. Paquette 37

38 Collision handling J. Gagnon & E. Paquette 38

39 Procedural icicle modeling 39 J. Gagnon & E. Paquette

40 Surface creation Goal – Create a photorealistic icicle mesh – Provide configurable surface – Manage fusion between icicles – Attach the icicle to the surface J. Gagnon & E. Paquette 40

41 Surface creation Methodology – Profile function – Icicle’s base function – Glaze ice function J. Gagnon & E. Paquette 41

42 Surface creation Methodology – Profile function – Icicle’s base function – Glaze ice function J. Gagnon & E. Paquette 42

43 Profile function J. Gagnon & E. Paquette 43

44 Profile function J. Gagnon & E. Paquette 44

45 Profile function { J. Gagnon & E. Paquette 45 {

46 Profile function J. Gagnon & E. Paquette 46

47 Implicit surface modeling Using metaballs Radius is defined by the profile function Positionned along the trajectory J. Gagnon & E. Paquette 47

48 Surface creation: results J. Gagnon & E. Paquette 48

49 Real vs generated J. Gagnon & E. Paquette 49

50 Surface creation Methodology – Profile function – Icicle’s base function – Glaze ice function J. Gagnon & E. Paquette 50

51 Icicle’s base J. Gagnon & E. Paquette 51

52 Icicle’s base J. Gagnon & E. Paquette 52

53 Icicle’s base Modeled with metaballs Radius function J. Gagnon & E. Paquette 53

54 Icicle’s base: Results J. Gagnon & E. Paquette 54

55 Surface creation Methodology – Profile function – Icicle’s base function – Glaze ice function J. Gagnon & E. Paquette 55

56 Three type of solidification J. Gagnon & E. Paquette 56 Glaze ice

57 J. Gagnon & E. Paquette 57

58 Glaze ice: Results J. Gagnon & E. Paquette 58

59 Overview 1.Previous work 2.Proposed approach 3.Results 4.Limitations & Conclusion 59 J. Gagnon & E. Paquette

60 Results J. Gagnon & E. Paquette 60 Video

61 L. Leblanc, J. Houle and P. Poulin Modeling with Blocks, CGI J. Gagnon & E. Paquette 61

62 Results statistics J. Gagnon & E. Paquette 62 FiguresTeapotFountainBuddhaBunnyArmadilloDragonTree Number of icicles Computation times (seconds) Water coefficients Drip points Trajectories Surface modeling Total time

63 Overview 1.Previous work 2.Proposed approach 3.Results 4.Limitations & Conclusion 63 J. Gagnon & E. Paquette

64 Limitations Not physically accurate Implicit surface modeling is slow Rendering is slow J. Gagnon & E. Paquette 64

65 Conclusion J. Gagnon & E. Paquette 65 Control L-System to generate several icicle types Functions for ice thickness Interactivity Computation rearranged in four phases Fast computation of flow and trajectories

66 Questions J. Gagnon & E. Paquette 66

67 Curvature angle c J. Gagnon & E. Paquette 67

68 Dispersion angle au J. Gagnon & E. Paquette 68 a = au x 137.5˚/360 ˚


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