3D Modeling Essentials

1. 3D Modeling Essentials Introducing To 3D Modeling George Atanasov Telerik Corporation www.telerik.com

2. What is 3D Modeling? • 3D Modeling process • Representing any 3 dimensional surface • Automatic or Manual

3. What is 3D Model? • The product is called 3D model • 3D model can be: • Rendered to 2D image • Printed to realistic object with 3D printer • Used in 3D games with real-time rendering

4. Splines & NURBS • Vector design is better for industrial goals • Hands of the Craftsman vs. CPU Lathe

5. Polygon Mesh Objects • Polyhedral object • Best for games and physical simulations

6. Polygon Mesh Objects • Polygon mesh sub-object level • Vertex • Edge • Face • Polygon

7. Mesh vs. Spline • Why Mesh is better for game development? • More calculations == less FPS • Nowadays GPU’s are designed to perform faster with VBO’s (Vertex Buffer Objects) • Mesh objects can be easy represented in VBO • The absolute accuracy of the objects is not basic goal in the Games • In game developing the basic goal is to create best possible representation of object with by less possible resources

8. The 3D Scene • Three dimensional coordinate system • Represents uniquely all the points in it by three parameters – values for each axis • Contain sub-coordinate systems • Each object has his own local coordinate system

9. High-Poly Modeling Explaining High-Poly Design

10. High-Poly Modeling • We can understand the idea of high-poly modeling just by its name • The more triangles in the mesh, the more detailed the object is • It is

11. Low Poly Modeling Explaining Low-Poly Design

12. Low Poly Meshes • Low poly mesh is a mesh which has small amount of polygons • Commonly used in real-time applications • In theory polygons can have infinite number of sides, but in 3D graphics they are broken down into triangles

13. Why Low Poly? • Why we need to create low-poly models when there is so many smooth modifiers? • In general the more triangles in a mesh the more • detailed the object is • computationally intensive it is to display • To decrease render time it is better to use low poly models

14. The Polygon Budget • A combination of game engine and the computer being used defines the polygon budget • It is equal to the number of polygons which can appear in a scene and still be rendered with acceptable frame rate • It vary depending on the • speed of the render engine • the amount of polygons • The speed of the hardware

15. Low Poly As a Relative Term • There is no defined threshold for a mesh to be low poly • This term is relative and its definition depends on other factors: • The time the meshes were designed and for what • The detail required in the final mesh • The shape and properties of the object

16. Low Poly – Future vs. Past • Super Mario 2 – 1996 • In 1996 rendering an objects created by 240 polygons was a huge success • All the environment is created by textured extremely low polygon objects • Crysis 2 – 2011 • At 2011 rendering objects created by 24 000 polygons is not a big deal • The environment is created by averagely resolute objects

17. Appearance • Low poly objects does not always has to look bad • You can “lie” the viewer that the object has better resolution with techniques such as • Normal mapping • Bump mapping • Etc.

18. Smoothing Smoothing techniques

19. Smoothing • There is many methods to create a smooth objects • Normal smoothing • Mesh smoothing • Etc. • It is important to understand haw to use each one of them • You have to pick the best for your goals

20. Normal Smoothing • Normal smoothing affects only the way that the light is reflected by the objects surface • That is better for games, because the triangle count stays the same • Ends of the object remain edgy • Performs better on dark colors

21. Mesh Smoothing • Mesh smoothing affects directly the geometry of the object • Can be used many times on the same objects • Iteration value • With each iteration increase, the resolution of the object increases by square

22. Lights Understanding Lightning in 3D

23. Why We Need Lightning? • Modeling the 3D object is just a little part of the whole design process • The light makes the object to look as 3D object

24. How the Light Works? • For full realistic light simulation you would need a “NASA” computer • The lighting in 3D graphics is not exact representation of the real light • In most 3D engines the light appearance is decayed to separate effects independent each other

25. Abstract Types Of Lights • The light is composed by several abstract components • Diffuse, Ambient, Specular, Emissive, Reflection, Refraction • Each light component can has its own color • It is important to understand how to deal with each type of them • And it is more than important to understand how the real light affects the objects

26. Ambient Light • When sun ray hit an object it reflects from it • The ambient light is the emission of all light sources • The result is averagely brightening whole object • 3D object with only ambient light channel applied to it looks 2D

27. Diffuse Light • Diffuse light represents a directional light cast by a light source • It can be explained as a light from light bulb placed on specific location in the space • A diffuse light of red color, coming from the left of a black object defining its 3D shape

28. Diffuse light • For more realistic result we can apply the both diffuse and ambient light channels • The diffuse light represents a light from a light bulb and flashing the front side of the object • The ambient light brightens the entire object

29. Specular Light • The specular light channel represents the brightest area of the object (the highlight area) • The position and the amount of specular highlight is depending on • Viewers position • The angle between the viewer and the source

30. Emissive Light • Emissive light is working a little different than the explained before types of lights • It is responsible for the object material ability to absorb or reflect light • Below is the result of object emitting green light with red light source applied

31. Reflections • The use of reflections helps to create more realistic objects • Remember... You wont see the reflection effect if you don’t have another objects to reflect • Reflection looks better on round objects • Do not overdo with the reflection effect • Reflection mapping saves time

32. Refractions • The refraction property defines how much light goes through the object • In simple language it controls the opacity of the object • Refraction color #000000 == full opacity • Refraction color #FFFFFF == full transparency

33. Textures Learn Texturing Essentials

34. Textures? • Textures are just simple raster pictures • JPEG • PNG • TGA • GIF • TIFF • Widely used in 3D game modeling

35. Why You Have To Use Them? • If you are developing a car racing game you do not need to model all the details on the buildings behind • By texturing your object you can add a lot of details on the model without adding any more resolution to it • For example you can use a texture of window instead of modeling it

36. Texturing Methods • There is several ways to texturize an object • Which one is better depends on the object which is going to be texturized • In game developing process the basic texturing methods are • UVW Mapping • Tiling • UVW Unwrapping

37. What is Tiled Texture • Tiling is another trick which saves a lot of resources • To understand it, imagine that you have to represent the facade of a huge building by texturing • The idiotic way is to draw a huge texture with a lot and the same windows in it • The right way is to draw a texture with only one window on it and multiply it

38. Texture Optimization Tricks • Creating details with textures instead of polygons saves render time • Do not flood your 3D scene with huge amount of textures • Do not use bigger textures than you need • Manage balance between quality and size • When it is possible use texture modulation

39. Texture Modulation • Useful for level editing (creating environment) • You want to model brown one and the same roof tiles, but in different colors • Use white (or bright) roof tile texture and modulate it with the color of its object • You can create many different looking models with the use of one and the same resource

40. Use Transparency • OK… We have to create a metal fence • But how many polygons we need? • First way is to create it as a polygon mesh • 100 000 polygons for 1 meter wide fence ?!? • The trick to do that is to use a texture of metal fence with transparency at the empty spaces • 2 polygons and the result looks the same

41. UV(W) Mapping • Projects a texture map to 3D object • Assigns pixels of the image on the polygons • Allows you to texturize more complex shapes

42. Unwarp UVW • A very useful technique for texturing game characters and other complex objects

43. Tools & Software What Software To Use

44. Define Your Goals • Your goals are ? • Making super cool 3D game models • Making very detailed models for commercials, magazine covers, movies, etc. • Making 3D models for an industrial goals • Level editing for games • You are learning

45. 3D Modeling Essentials ? ? Questions? ? ? ? ? ? ? ? ? ?