Casing3d opengl
- 1. Casing3D 3 pyopengl qtopengl
- 2. • casing3D • Opengl • Opengl • Qtopengl • casing3D
- 4. OpenGL • OpenGL • api • • GLUT • •
- 5. OpenGL s State Machine • All rendering a<ributes are encapsulated in the OpenGL State – rendering styles – shading – ligh?ng – texture mapping 5
- 6. Manipula?ng OpenGL State • Appearance is controlled by current state for each ( primi?ve to render ) { update OpenGL state render primi?ve } • Manipula?ng vertex a<ributes is most common way to manipulate state glColor*() / glIndex*() glNormal*() glTexCoord*() 6
- 7. Controlling current state • SeKng State glPointSize( size ); glLineStipple( repeat, pattern ); glShadeModel( GL_SMOOTH ); • Enabling Features glEnable( GL_LIGHTING ); glDisable( GL_TEXTURE_2D ); 7
- 8. Camera Analogy • 3D is just like taking a photograph (lots of photographs!) viewing volume camera tripod model 8
- 9. Camera Analogy and Transforma?ons • Projec?on transforma?ons – adjust the lens of the camera • Viewing transforma?ons – tripod–define posi?on and orienta?on of the viewing volume in the world • Modeling transforma?ons – moving the model • Viewport transforma?ons – enlarge or reduce the physical photograph 9
- 10. Transforma?on Poly. Per Vertex Pipeline CPU DL Pixel Texture Raster Frag FB object eye clip normalized window device v e r Modelview Projection Perspective Viewport t e Matrix Matrix Division Transform x Modelview Projection • other calcula?ons here – material è color Modelview – shade model (flat) – polygon rendering mode l l – polygon culling l – clipping 10
- 11. Projec?on Tutorial 11
- 12. Opengl
- 13. From the 1994 OpenGL 1.1 Data Flow… storage selec<on / feedback / transform feedback access opera<ons rasteriza?on vertex vertex & fragment blending puller processing depth tes<ng coloring stencil tes<ng accumula<on glDrawElements glVertex* glDrawArrays glColor* glTexCoord* etc. client raster texture framebuffer memory opera?ons glTex{Sub}Image glDrawPixels glCopyTex{Sub}Image glBitmap glCopyPixels pixel unpack pixel transfer pixel glReadPixels / glCopyPixels / glCopyTex{Sub}Image pack
- 14. …OpenGL 1.0 in detail primi?ve topology, transformed Legend vertex data Geometric primi?ve Vertex Vertex assembly & ver?ces assembly primi?ve processing batch processing programmable opera?ons pixels type, vertex data fragments point, line, and polygon fixed-‐func?on filtered texels fragments opera?ons buffer data stenciling, depth tes?ng, primi?ve batch type, blending, accumula?on vertex a<ributes Texture Fragment Raster Framebuffer mapping fragment processing opera?ons texture Command fetches parser pixel image image and bitmap texture fragments image pixel image or specifica?on texture image Pixel specifica?on packing pixels to pack image rectangles, bitmaps Image Pixel Pixel primi?ve unpacking unpacked processing pixels processing copy pixels, copy texture image
- 15. …to the 2009 OpenGL 3.2 Data Flow uniform/ primi?ve topology, parameters transformed buffer objects Legend vertex data Geometric primi?ve Vertex Vertex assembly & ver?ces assembly primi?ve processing batch processing programmable transformed opera?ons pixels type, vertex vertex data a<ributes fragments point, line, and polygon fixed-‐func?on filtered texels geometry fragments opera?ons Transform texture buffer data vertex fetches buffer transform feedback objects feedback buffer pixels in framebuffer object textures objects stenciling, depth tes?ng, primi?ve batch type, vertex texture blending, accumula?on vertex indices, vertex a<ributes texture fetches buffer buffer data, objects Texture Fragment Raster unmap Framebuffer mapping fragment processing opera?ons buffer texture Command Buffer fetches parser store pixel map buffer, pack get buffer buffer data objects texture image and bitmap fragments pixel image pixel image or unpack specifica?on texture image buffer Pixel specifica?on objects packing pixels to pack image rectangles, bitmaps Image Pixel Pixel primi?ve unpacking unpacked processing pixels processing copy pixels, copy texture image Buffer cache
- 16. Patch Control point Patch tessella?on Patch evalua?on assembly & processing transformed transformed genera?on transformed processing control points processing patch transformed patch, bivariate patch control patch domain tessella?on patch topology, evaluated patch vertex texture points fetches primi?ve topology, transformed Legend Vertex Vertex vertex data Geometric primi?ve assembly & patch data assembly primi?ve processing batch transformed processing programmable ver?ces opera?ons type, vertex pixels vertex data a<ributes point, line, fragments and polygon fixed-‐func?on geometry filtered texels fragments opera?ons vertex Transform texture feedback fetches buffer data buffer transform objects feedback pixels in framebuffer object textures buffer objects stenciling, depth tes?ng, primi?ve batch type, vertex texture blending, accumula?on vertex indices, vertex a<ributes texture fetches buffer buffer data, objects Texture Fragment Raster unmap Framebuffer mapping fragment processing opera?ons buffer pixel texture Command Buffer pack fetches parser store buffer map buffer, get buffer objects data image and bitmap texture fragments pixel image pixel image or unpack Pixel specifica?on texture image buffer packing specifica?on objects OpenGL 4 pixels to pack image rectangles, bitmaps Image Pixel Pixel primi?ve copy pixels, unpacking unpacked processing processing copy texture image pixels
- 17. Buffer Centric View of OpenGL Array Element glBegin, glDrawElements, etc. Buffer Object Texture (VeBO) Buffer Object (TexBO) Vertex Array Buffer Vertex Puller Object (VaBO) texel data Transform Feedback Buffer Vertex Shading Pixel Unpack (XBO) Buffer (PuBO) vertex data Texturin g Geometry glDrawPixels, glTexImage2D, etc. Parameter Shading Buffer (PaBO) glReadPixels, Pixel Pack etc. Fragment Pixel Buffer Bindable Shading Pipeline (PpBO) Uniform pixel data Buffer (BUB) parameter data (not ARB func<onality yet) Framebuffer
- 18. pyopengl
- 19. GLUT Basics • Applica?on Structure – Configure and open window – Ini?alize OpenGL state – Register input callback func?ons • render • resize • input: keyboard, mouse, etc. – Enter event processing loop 19
- 20. Hello, World from OpenGL.GL import * from OpenGL.GLU import * from OpenGL.GLUT import * glutInit("Hello, World") glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH) glutInitWindowSize(400,400) glutCreateWindow("Hello, World") glClearColor(0.,0.,0.,1.) glutSetDisplayFuncCallback(display) glutDisplayFunc() glutMainLoop() © 2000 Richard P. Muller
- 21. OpenGL Geometric Primi?ves • All geometric primi?ves are specified by ver?ces GL_LINES GL_POLYGON GL_LINE_STRIP GL_LINE_LOOP GL_POINTS GL_TRIANGLES GL_QUADS GL_QUAD_STRIP GL_TRIANGLE_STRIP GL_TRIANGLE_FAN 21
- 22. Shapes Tutorial 22
- 23. Qtopengl from OpenGL.GL import * from OpenGL.GLU import * from OpenGL.GLUT import * class Casing3DApp(QtGui.QWidget): class Casing3DGLWidget(QtOpenGL.QGLWidget): def initializeGL(self): def paintGL(self): def resizeGL(self, width, height): def mouseMoveEvent(self, event):