The main challenges in mobile games are performance and file size. Find out how they leveraged Houdini to develop a track generation tool that automatically populates road markings, apexes and walls depending on curvature while maintaining good vertex counts and lightmap resolution.

1. Procedural Race
Tracks
For Mobile Games

2. Stoyan Dimitrov
Senior Technical Artist

4. Procedural Generation
Before Houdini

8. RACE
TRACK
GENERATOR

9. 9

11. TRACK PARTS
Snap together premade
track parts

12. CURVE DEFORM
Bend a series of parts to
conform to a Bezier curve

15. WAIT!
4.5 minutes to create the track mesh

16. FINAL RESULT

18. 30,000 Vertices
Budget
45/60 FPS
Current/Target Framerate
73,247 Vertices
Current Track

20. HOUDINI
Procedural node based
content creation tool

21. Unity to Houdini Engine
⊗ Track Spline
⊗ Local Point Parameters
⊗ Material & Mesh Paths

22. Track Spline

23. Local Point Parameters
Middle Road
Road
Distance
Off-road
Off-road
Distance

24. Material & Mesh Paths

25. 25

27. WALLS
How we got over that barrier

28. 28

30. Road Caps

31. APEXES & DECALS
It took a turn for the better

32. Apexes

33. Decals

34. GENERATING UVS

35. Road UVs

36. Lightmap UVs
UV Flatten
Cut every 3
meters

39. 30,000 Vertices
Budget
60/60 FPS
Current/Target Framerate
73,247 Vertices
Current Track
13,276 Vertices
Houdini Track

40. 40

41. ANY QUESTIONS?
Stoyan Dimitrov
@stoyan3d
Space Ape Games
spaceapegames.com