{"id":4717,"date":"2016-02-05T09:48:06","date_gmt":"2016-02-05T09:48:06","guid":{"rendered":"http:\/\/anthroponaute.fr\/blog-informatique\/?p=4717"},"modified":"2016-02-10T17:47:32","modified_gmt":"2016-02-10T17:47:32","slug":"generer-une-sphere","status":"publish","type":"post","link":"https:\/\/www.la-porte-des-nebuleuses.net\/blog-informatique\/?p=4717","title":{"rendered":"G\u00e9n\u00e9rer une sph\u00e8re MeshSceneNode"},"content":{"rendered":"

\"Sphere\"<\/a><\/p>\n

Intro :<\/strong><\/p>\n

Il peut \u00eatre utile de savoir g\u00e9n\u00e9rer une sph\u00e8re<\/strong> \u00e0 la vol\u00e9e par la d\u00e9finition de ses vertices et de ses indices.<\/p>\n

Pr\u00e9requis : <\/strong><\/p>\n

– Savoir lire du C++<\/em><\/p>\n

– Savoir initialiser DirectX 10<\/em><\/p>\n

– Savoir utiliser et comprendre un peu de trigonom\u00e9trie<\/em><\/p>\n

– Savoir utiliser la classe Renderable<\/em><\/p>\n

– Savoir utiliser la classe MeshSceneNode<\/em><\/p>\n

– Savoir utiliser la classe ShaderTechnique<\/em><\/p>\n

Explications : <\/strong><\/p>\n

Voici l’impl\u00e9mentation de la classe shader<\/strong> :<\/p>\n

\r\n\/\/------------------------------------------------------\r\n\/\/ Simple shader avec texturage\r\n\/\/------------------------------------------------------\r\nclass ShaderTechnique_BasicTexture : public ShaderTechnique\r\n{\r\npublic:\r\n\u00a0\u00a0 \u00a0ShaderTechnique_BasicTexture(const std::string& sTextureFileName);\r\n\u00a0\u00a0 \u00a0virtual ~ShaderTechnique_BasicTexture();\r\n\r\n\u00a0\u00a0 \u00a0virtual bool Initialize();\r\n\r\n\u00a0\u00a0 \u00a0virtual void SetupShaderVariables();\r\n\r\n\u00a0\u00a0 \u00a0virtual void Update(float fTimeSinceLastFrame);\r\n\r\nprivate:\r\n\u00a0\u00a0 \u00a0std::string m_sTextureFileName;\r\n};\r\n\r\n<\/pre>\n
 <\/p>\n
Voici le fichier ShaderTechnique_BasicTexture.cpp :<\/p>\n
\r\n#include "ShaderTechnique_Declarations.h"\r\n\r\nShaderTechnique_BasicTexture::ShaderTechnique_BasicTexture(const std::string& sTextureFileName) :\r\nShaderTechnique("SimpleTextureEffect.fx", "Render", VertexLayoutType::PTN_VERTEX),\r\nm_sTextureFileName(sTextureFileName)\r\n{\r\n}\r\n\r\nShaderTechnique_BasicTexture::~ShaderTechnique_BasicTexture()\r\n{\r\n}\r\n\r\nbool ShaderTechnique_BasicTexture::Initialize()\r\n{\r\n\u00a0\u00a0 \u00a0if (ShaderTechnique::Initialize() == false)\r\n\u00a0\u00a0 \u00a0{\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0return false;\r\n\u00a0\u00a0 \u00a0}\r\n\r\n\u00a0\u00a0 \u00a0SetupShaderVariables();\r\n\r\n\u00a0\u00a0 \u00a0return true;\r\n}\r\n\r\nvoid ShaderTechnique_BasicTexture::SetupShaderVariables()\r\n{\r\n\u00a0\u00a0 \u00a0RegisterMatrixVariable("World", ShaderVariableType::WORLD);\r\n\u00a0\u00a0 \u00a0RegisterMatrixVariable("View", ShaderVariableType::VIEW);\r\n\u00a0\u00a0 \u00a0RegisterMatrixVariable("Projection", ShaderVariableType::PROJECTION);\r\n\r\n\u00a0\u00a0 \u00a0RegisterTextureVariable("txDiffuse");\r\n\r\n\u00a0\u00a0 \u00a0AddTexture(m_sTextureFileName.c_str());\r\n\r\n\u00a0\u00a0 \u00a0SetTexture("txDiffuse", 0);\r\n}\r\n\r\nvoid ShaderTechnique_BasicTexture::Update(float fTimeSinceLastFrame)\r\n{\r\n    \/\/ On fait tourner la sph\u00e8re \/ plan\u00e8te\r\n\u00a0\u00a0 \u00a0D3DXMATRIX mat;\r\n\u00a0\u00a0 \u00a0static float r = 0.0f;\r\n\r\n\u00a0\u00a0 \u00a0r += fTimeSinceLastFrame * 0.3f;\r\n\r\n\u00a0\u00a0 \u00a0D3DXMatrixRotationY(&mat, r);\r\n\r\n\u00a0\u00a0 \u00a0SetMatrix("World", &mat);\r\n\r\n\u00a0\u00a0 \u00a0SetAutoMatrix(ShaderVariableType::VIEW);\r\n\u00a0\u00a0 \u00a0SetAutoMatrix(ShaderVariableType::PROJECTION);\r\n}\r\n<\/pre>\n
 <\/p>\n
Voici le fichier SphereMeshSceneNode.h :<\/p>\n
\r\n#ifndef SPHERE_MESH_SCENE_NODE_H\r\n#define SPHERE_MESH_SCENE_NODE_H\r\n\r\n#include "MeshSceneNode.h"\r\n#include "Types.h"\r\n\r\nclass SphereMeshSceneNode : public MeshSceneNode\r\n{\r\npublic:\r\n\u00a0\u00a0 \u00a0SphereMeshSceneNode();\r\n\u00a0\u00a0 \u00a0virtual ~SphereMeshSceneNode();\r\n\r\n\u00a0\u00a0 \u00a0void CreateSphere(uint16 iRings, uint16 iSectors, uint16 iRadius);\r\n\r\nprivate:\r\n\r\n};\r\n\r\n#endif\r\n<\/pre>\n
 <\/p>\n
Voici le fichier SphereMeshSceneNode.cpp :<\/p>\n
\r\n#include <vector>\r\n\r\n#include "SphereMeshSceneNode.h"\r\n#include "Types.h"\r\n#include "ShaderTechnique_Declarations.h"\r\n\r\nSphereMeshSceneNode::SphereMeshSceneNode()\r\n{\r\n\u00a0\u00a0 \u00a0\/\/ Chercher sur Google Image d'autres textures sph\u00e9riques\r\n\u00a0\u00a0 \u00a0SetShaderTechnique( new ShaderTechnique_BasicTexture("earth.jpg") );\r\n\u00a0\u00a0 \u00a0CreateSphere(40, 40, 4);\r\n}\r\n\r\nSphereMeshSceneNode::~SphereMeshSceneNode()\r\n{\r\n}\r\n\r\n\/\/ Voil\u00e0 la m\u00e9thode qui cr\u00e9er la sph\u00e8re\r\nvoid SphereMeshSceneNode::CreateSphere(uint16 iRings, uint16 iSectors, uint16 iRadius)\r\n{\r\n\u00a0\u00a0\u00a0 std::vector<PTNVertex> vertices;\r\n\u00a0\u00a0\u00a0 std::vector<uint16> indices;\r\n\u00a0\u00a0 \u00a0\r\n\u00a0\u00a0\u00a0 float R = 1.f\/(float)(iRings-1);\r\n\u00a0\u00a0\u00a0 float S = 1.f\/(float)(iSectors-1);\r\n\r\n\u00a0\u00a0\u00a0 for (uint32 r = 0; r < iRings; r++)\r\n\u00a0\u00a0 \u00a0{\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0for (uint32 s = 0; s < iSectors; s++)\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0{\r\n#define MATH_PI 3.141592653589793f\r\n#define MATH_PI_2 MATH_PI \/ 2\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0float const y = sin( -MATH_PI_2 + MATH_PI * r * R );\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0float const x = cos(2*MATH_PI * s * S) * sin( MATH_PI * r * R );\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0float const z = sin(2*MATH_PI * s * S) * sin( MATH_PI * r * R );\r\n\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0PTNVertex v;\r\n\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0v.position.x = x * iRadius;\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0v.position.y = y * iRadius;\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0v.position.z = z * iRadius;\r\n\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0v.texture.x = 1 - s*S;\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0v.texture.y = r*R;\r\n\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0v.normal.x = -x;\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0v.normal.y = -y;\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0v.normal.z = -z;\r\n\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0vertices.push_back(v);\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0}\r\n\u00a0\u00a0 \u00a0}\r\n\r\n\u00a0\u00a0\u00a0 for (uint16 y = 0; y < iRings - 1; y++)\r\n\u00a0\u00a0\u00a0 {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 for (uint16 x = 0; x < iSectors - 1; x++)\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 indices.push_back( ((y + 0) * iSectors + x) );\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 indices.push_back( ((y + 1) * iSectors + x) );\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 indices.push_back( ((y + 1) * iSectors + x + 1) );\r\n\u00a0\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 indices.push_back( ((y + 1) * iSectors + x + 1) );\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 indices.push_back( ((y + 0) * iSectors + x + 1) );\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 indices.push_back( ((y + 0) * iSectors + x) );\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }\r\n\u00a0\u00a0\u00a0 }\r\n\u00a0\u00a0 \u00a0\r\n\u00a0\u00a0 \u00a0Build(vertices, indices);\r\n}\r\n<\/pre>\n
 <\/p>\n
R\u00e9sum\u00e9 :<\/strong><\/p>\n
Nous avons appris comment g\u00e9n\u00e9rer une sph\u00e8re en 3D avec ses coordonn\u00e9es de texture et normales.<\/p>\n
R\u00e9f\u00e9r\u00e9nces :<\/strong><\/p>\n
– http:\/\/stackoverflow.com\/questions\/5988686\/creating-a-3d-sphere-in-opengl-using-visual-c<\/p>\n","protected":false},"excerpt":{"rendered":"
Intro : Il peut \u00eatre utile de savoir g\u00e9n\u00e9rer une sph\u00e8re \u00e0 la vol\u00e9e par la d\u00e9finition de ses vertices et de ses indices. Pr\u00e9requis : – Savoir lire du C++ – Savoir initialiser DirectX 10 – Savoir utiliser et comprendre un peu de trigonom\u00e9trie – Savoir utiliser la classe Renderable – Savoir utiliser la […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[19],"tags":[],"_links":{"self":[{"href":"https:\/\/www.la-porte-des-nebuleuses.net\/blog-informatique\/index.php?rest_route=\/wp\/v2\/posts\/4717"}],"collection":[{"href":"https:\/\/www.la-porte-des-nebuleuses.net\/blog-informatique\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.la-porte-des-nebuleuses.net\/blog-informatique\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.la-porte-des-nebuleuses.net\/blog-informatique\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.la-porte-des-nebuleuses.net\/blog-informatique\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4717"}],"version-history":[{"count":16,"href":"https:\/\/www.la-porte-des-nebuleuses.net\/blog-informatique\/index.php?rest_route=\/wp\/v2\/posts\/4717\/revisions"}],"predecessor-version":[{"id":4941,"href":"https:\/\/www.la-porte-des-nebuleuses.net\/blog-informatique\/index.php?rest_route=\/wp\/v2\/posts\/4717\/revisions\/4941"}],"wp:attachment":[{"href":"https:\/\/www.la-porte-des-nebuleuses.net\/blog-informatique\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4717"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.la-porte-des-nebuleuses.net\/blog-informatique\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4717"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.la-porte-des-nebuleuses.net\/blog-informatique\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4717"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}