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3D Programming and DirectX API

3D Programming and DirectX API. Content. Mathematics Prepare to Write a 3D program Program Structure How does the computer calculate 3D image? Illustration Other Features in DirectX Library. Mathematics.

jerome-chapman
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3D Programming and DirectX API

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  1. 3D Programming and DirectX API

  2. Content • Mathematics • Prepare to Write a 3D program • Program Structure • How does the computer calculate 3D image? • Illustration • Other Features in DirectX Library

  3. Mathematics • Don’t worry! If you see this chapter in the book, just skip it, because you’ve learned. • Importance of “Transform” • Translation • Rotation • Scaling • …… • Vector & Matrix • Other Advanced Algorithm

  4. Prepare to Write a 3D program • Using Direct3D • Compiler - VS.NET 2003 • Download DirectX SDK • http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnanchor/html/anch_directx.asp • DirectX 9.0 SDK Update - (February 2005) • An Easy Book • MSDN – http://www.msdn.com

  5. Program Structure • Initialize D3D Library – Create Device • Loading or Building Model • Set Light, Material, and Texture • Calculate Transform Matrix, View Matrix , and Projection Matrix • Render!

  6. Initialize D3D Library • IDirect3D9* • Direct3DCreate9(D3D_SDK_VERSION) • IDirect3DDevice9* • CreateDevice() 3D Device( 3D Card) Direct3DCreate9() CreateDevice() IDirect3DDevice9* IDirect3D * D3DLibrary

  7. How does the computer calculate 3D image? • CPU and GPU (Graphic Process Unit) • 3D Library – OpenGL and Direct3D

  8. How does the computer calculate 3D image? • Pipeline CPU GPU Light, Texture, Material Vertex Data Data in Model Space World Space Camera Space World Matrix View Matrix View Space (your screen) Projection Matrix

  9. Loading and Building Modal • Vertex/Index Buffer • The Structure of Vertex V1 V3 V3 V1 V2 V4 … Vertex Buffer V4 1 2 3 1 4 2 … Index Buffer V2

  10. Loading and Building Modal nZ U struct Vertex { float x, y, z; float nx, ny, nz; float u, v; // texture coordinates }; #define FVF_VERTEX (D3DFVF_XYZ | D3DFVF_NORMAL| D3DFVF_TEX1) Demo 1-TexCube X Y Z nX nY V …

  11. Loading and Building Modal • X-file • When the model is complex, we can’t build it in our code. • Using 3D graphic tool, ex. Maya, 3D studio MAX, Lightwave, MilkShake • Direct3D have already provide funcs to load and parse X-file • Static Model and Animation Model

  12. Set Light, Material, and Texture • Light - light source D3DLIGHT9 light; light.Type = D3DLIGHT_DIRECTIONAL; light.Ambient = D3DXCOLOR(0.8f, 0.8f, 0.8f, 1.0f); light.Diffuse = D3DXCOLOR(1.0f, 1.0f, 1.0f, 1.0f); light.Specular = D3DXCOLOR(0.2f, 0.2f, 0.2f, 1.0f); light.Direction = D3DXVECTOR3(1.0f, -1.0f, 0.0f); Demo 2-TexCube 3-TexCube 4-TexCube

  13. Set Light, Material, and Texture • Material – reflection of light {0.0, 1.0, 1.0, 1.0} {1.0, 1.0, 0.0, 1.0} {1.0, 0.0, 1.0, 1.0} Demo EffetEdit

  14. Set Light, Material, and Texture • Texture – surface of 3D object Demo 4-Tex 5-Tex

  15. Calculate World Matrix, View Matrix , and Projection Matrix • World Matrix • D3DXMatrixTranslation(…) • D3DXMatrixRotationX(…) • D3DXMatrixIdentity(…) • D3DXMatrixScaling(…)

  16. Calculate World Matrix, View Matrix , and Projection Matrix • View Matrix • D3DXMatrixLookAtLH(&V, &position, &target, &up);

  17. Calculate World Matrix, View Matrix , and Projection Matrix • Projection Matrix D3DXMatrixPerspectiveFovLH();

  18. Demo 7-TexCube 8-TexCube

  19. Render!! • Prepare for render Device->SetTransform(D3DTS_VIEW, &V); Device->SetTransform(D3DTS_WORLD, &V); Device->SetTransform(D3DTS_PROJECTION, &V); • Start and Finish Render Device->Clear(0, 0, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, 0xffffffff, 1.0f, 0); Device->BeginScene(); ……./* render render render !!!! */…. Device->EndScene();

  20. Render !! if( mtrl ) device->SetMaterial(mtrl); if( tex ) device->SetTexture(0, tex); device->SetStreamSource(0, _vb, 0, sizeof(Vertex)); device->SetIndices(_ib); device->SetFVF(FVF_VERTEX); device->DrawIndexedPrimitive( D3DPT_TRIANGLELIST, 0, 0, 24, 0, 12); Set Material Set Texture Set Index Buffer Tell D3D your vertex format Just Draw It!!

  21. More Skill • Terrain – Height Map • Shadow • Other Algorithm… • Good website :www.gamedev.net

  22. Samples • Airplane • Walking Man • BasicHLSL • ShadowVolume • Terrain

  23. Other Features in DirectX Library • DirectPlay • Network Game • DirectSound • Handle sound effect

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