openFrameworks 007 - 3D

openFrameworks 3D

3D ofNode ofMesh of3dUtilsofCameraofEasyCam

ofCameraCamera movement and matrices• Extends from ofNode• Basic GLUT camera functions• Coordinate conversions

ofCameraFrustum setup angle of field of view in y direction, in degrees setFov(float) (45-60) setNearClip(float) near clipping plane distance setFarClip(float) set far clipping plane distance

ofCameraPerspective and modelview matrices getProjectionMatrix() Ortho / Perspective getModelViewMatrix() Position/Orientation getModelViewProjectionMatrix() Modelview * Projection

ofCameraCoordinate conversion worldToScreen() Convert openGL world to screen screenToWorld() Convert screen to GL world worldToCamera() Convert world to camera cameraToWorld() Convert camera to world

ofCamera testApp.hclass testApp : public ofBaseApp{ public: ... ofCamera cam; };

ofCamera testApp.cppvoid testApp::setup(){ ofBackground(33,33,33); cam.setNearClip(0.1); cam.setFarClip(100); // "1 meter" to the right, "5 meters" away from object cam.setPosition(ofVec3f(1,0,5));}void testApp::draw(){ cam.begin(); glPointSize(10); glBegin(GL_POINTS); glVertex3f(0,0,0); glEnd(); cam.end();}

ofNode

ofNode3D object container• Standard 3D scene item• Manage position, scale and orientation• Lots of fantastic helper functions• ofCamera extends from this class

ofNodeMovement truck() Move left to right (x-axis) boom() Move up and down (y-axis) dolly() Move forward and backward (z-axis) setPosition() Set position directly

ofNodeRotation tilt() Rotate around x-axis pan() Rotate around y-axis dolly() Rotate around z-axis rotate(a,axis) Rotate around arbitrary axis

ofNodeTesting movement/orientation Apply ofNode transformation (does a transformGL() glPushMatrix/glMultMatrixf()) Does a glPopMatrix, call after transformGL and restoreTransformGL() drawing. resetTransform() Resets the orientation and position

ofNodevoid setScale(float s)void setScale(float x, float y, float z)void setScale(const ofVec3f& p)void setPosition(float x, float y, float z)void setPosition(const ofVec3f& p)void setGlobalPosition(float x, float y, float z)void setGlobalPosition(const ofVec3f& p)void setOrientation(const ofQuaternion& q)void setOrientation(const ofVec3f& eulerAngles)void setGlobalOrientation(const ofQuaternion& q)

ofNodeCustom 3D nodes• Create custom class and inherit from ofNode• Implement virtual customDraw(void) member function.• To draw, just call draw(void) on instance

ofNode Extend ofNodeclass MyCustom3DNode : public ofNode {public: virtual void customDraw() { ofSphere(0,0,0,0.7); ofDrawAxis(2 ); }};

ofEasyCamCamera interaction made easy begin()/end() Put your draw calls between these setTarget(ofNode) Follow and look at a target

ofEasyCam Custom ofNode - example ofEasyCamclass MyCustom3DNode : public ofNode {public: virtual void customDraw() { ofSphere(0,0,0,0.7); ofDrawAxis(2); }};class testApp : public ofBaseApp{ public: ofEasyCam easy_cam; vector<MyCustom3DNode*> custom_nodes; MyCustom3DNode* mover;};

ofEasyCam Custom ofNode - example ofEasyCamvoid testApp::setup(){ ofBackground(33,33,33); // set distance of camera "5" meters away easy_cam.setDistance(5); // create a bunch of custom 3D nodes float r = 4; for(int i = 0; i < 10; ++i) { MyCustom3DNode* node = new MyCustom3DNode(); node->setPosition( cos((float)i/10*TWO_PI) * r ,sin((float)i/10*TWO_PI) * r ,-5 ); custom_nodes.push_back(node); mover = node; } // set target for camera easy_cam.setTarget(*mover);}

ofEasyCam Custom ofNode - example ofEasyCamvoid testApp::draw(){ easy_cam.begin(); // draw custom nodes. for(int i = 0; i < custom_nodes.size(); ++i) { custom_nodes[i]->draw(); } // move over x-axis. float truck_amount = sin(ofGetElapsedTimef()*0.5) * 0.001; mover->truck(truck_amount); easy_cam.end();}

ofMeshContainer for all vertex related data• Use this when working with 3D meshes. It creates a model that is used by openGL to draw 3D shapes.• Future proof (ready for modern openGL)• Clean API for most used data: add[Vertex,Color,TexCoord]()• Nice interface for writing 3D exports (OBJ, PLY)• Use this with Vertex Buffer Objects (VBO)

ofMeshAdding vertices addVertex(ofVec3f) Add one vertex addVertices(vector<ofVec3f>&) Reference to ofVec3f addVertices(ofVec3f*, int num) Pointer to vertices setVertex(int index) Remove by indexRemove vertices removeVertex(int index) Remove by index clearVertices() Remove all verticesGet vertex getVertex(int) Get one vertex

ofMeshAdding normals addNormal(ofVec3f&) Add a normal addNormals(vector<ofVec3f>) Add vector of normals addNormals(ofVec3f*, int) Add array of normals setNormal(int, ofVec3f&) Set one normal by indexRemoving normals removeNormal(int) Remove by index clearNormals() Remove all normalsRetrieving normals getNormal(int) Get normal by index

ofMeshAdding indices addIndex(ofIndexType) Add a index addIndices(const<ofIndextype>&) Add a bunch of indices addIndices(ofIndexType*,int) Add bunch of indices setIndex(int, ofIndexType) Set a speciﬁc indexRemoving indices removeIndex(int i) Remove by index clearIndices() Remove all indicesRetrieving indices getIndex(int) Get index by index ;-)

ofMeshAdding colors addColor(const ofFloatColor& c) Add a index addColors(const<ofFloatColor>& cols) Add a bunch of indices addColors(const ofFloatColor* cols, int amt) Add bunch of indices setColor(int index, const ofFloatColor& c) Set a speciﬁc indexRemoving colors removeColor(int index) Remove by index clearColors() Remove all indicesRetrieving colors ofFloatColor getColor(int i) Get index by index ;-)

ofMeshUseful for GL_ARRAY_BUFFER / VBO getNumVertices() Total number of vertices getNumColors() Total number of colors getNumTexCoords() Total number of texture coords getNumIndices() Total number of indices float* getVerticesPointer() Get a pointer to the vertices float* getColorsPointer() Get a pointer to the colors float* getNormalsPointer() Get pointer to stored normals ofIndexType* getTexCoordsPointer() Get pointer to texcoords

ofMeshSame API for the rest• Same API for Colors, TexCoord• Helper function addTriangle(int,int,int)

Create two planes testApp.cpp void testApp::setup(){ // bottom cube.addVertex(ofVec3f(-1,0,1)); cube.addVertex(ofVec3f(1,0,1)); cube.addVertex(ofVec3f(1,0,-1)); cube.addVertex(ofVec3f(-1,0,-1)); // top cube.addVertex(ofVec3f(-1,1,1)); cube.addVertex(ofVec3f(1,1,1)); cube.addVertex(ofVec3f(1,1,-1)); cube.addVertex(ofVec3f(-1,1,-1)); // triangles bottom cube.addIndex(0); cube.addIndex(1); cube.addIndex(2); cube.addIndex(2); cube.addIndex(3);testApp.h cube.addIndex(0); class testApp : public ofBaseApp{ // triangles top cube.addIndex(4); public: cube.addIndex(5); ofMesh cube; cube.addIndex(6);}; cube.addIndex(6); cube.addIndex(7); cube.addIndex(4); }

Create a cube testApp.cpp void testApp::setup(){ // bottom vertices cube.addVertex(ofVec3f(-1,0,1)); cube.addVertex(ofVec3f(1,0,1)); cube.addVertex(ofVec3f(1,0,-1)); cube.addVertex(ofVec3f(-1,0,-1)); // top vertices cube.addVertex(ofVec3f(-1,1,1)); cube.addVertex(ofVec3f(1,1,1)); cube.addVertex(ofVec3f(1,1,-1)); cube.addVertex(ofVec3f(-1,1,-1)); // indices cube.addTriangle(0,1,2); // bottom cube.addTriangle(2,3,0); cube.addTriangle(4,5,6); // top cube.addTriangle(6,7,4); cube.addTriangle(0,4,5); // front cube.addTriangle(0,1,5);testApp.h cube.addTriangle(1,2,6); // right cube.addTriangle(6,5,1);class testApp : public ofBaseApp{ cube.addTriangle(2,6,3); // back cube.addTriangle(3,7,6); public: cube.addTriangle(0,3,7); // left ofMesh cube; cube.addTriangle(7,4,0);}; }

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openFrameworks 007 - 3D

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