Electronic Mechanical [Image Courtesy: Pixar] [Image Courtesy: - - PowerPoint PPT Presentation

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Electronic Mechanical [Image Courtesy: Pixar] [Image Courtesy: - - PowerPoint PPT Presentation

Jun 01, 2023 175 likes •440 views

Architectural Electronic Mechanical [Image Courtesy: Pixar] [Image Courtesy: humanproductivitylab.com Science Geometry(E+DD)projections Physics of light, color, appearance Algebra of transformations Engineering

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» Architectural » Electronic » Mechanical

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[Image Courtesy: Pixar]

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[Image Courtesy: humanproductivitylab.com

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» Science

  • Geometry(E+DD)projections
  • Physics of light, color, appearance
  • Algebra of transformations

» Engineering

  • Graphics software libraries, GUI
  • Graphics processor architectures

» Art

  • Color and perception
  • Illustrative views
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  • Imaging = representing 2D images
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  • Imaging = representing 2D images
  • Modeling = representing 3D objects
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  • Imaging = representing 2D images
  • Modeling = representing 3D objects
  • Rendering = constructing 2D images from 3D models
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  • Imaging = representing 2D images
  • Modeling = representing 3D objects
  • Rendering = constructing 2D images from 3D models
  • Animation = simulating changes over time
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  • OpenGL is a software API to graphics hardware.
  • Designed as a streamlined, hardware-independent

interface.

  • Intuitive, procedural interface with ‘C/C++’ binding.
  • To access the system, we have to used a library called GL.
  • Omitted windowing and input to avoid window system

dependencies .

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Links with window system (GLUT)

 GLX for X window systems, WGL for Windows  Cross-platform GUI libraries: GLUT, SDL, FLTK, QT, …

OpenGL core library (GL)

  • OpenGL32 on Windows
  • GL on most unix/linux systems (libGL.a)

OpenGL Utility Library (GLU)

  • Provides functionality in OpenGL core but avoids having

to rewrite code

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C++ with GDI * More than 400 LOC C++ with OpenGL * Less than 20 LOC

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Display List Polynomial Evaluator Per Vertex Operations & Primitive Assembly Rasterization Per Fragment Operations Texture Memory

CPU

Pixel Operations Frame Buffer

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int main( int argc, char ** argv){ glutInit( &argc, argv); glutCreateWindow( argv[0] ); glutDisplayFunc( display); glutMainLoop(); return 0; } void display(){ glClear( GL_COLOR_BUFFER_BIT); glBegin( GL_TRIANGLES); glVertex2f( 0, -.5); glVertex2f( -.5, .5); glVertex2f( .5, .5); glEnd(); glFlush(); }

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int main( int argc, char ** argv){ glutInit( &argc, argv); glutCreateWindow( argv[0] ); glutDisplayFunc( display); glutMainLoop(); return 0; } void display(){ glClear( GL_COLOR_BUFFER_BIT); glBegin( GL_TRIANGLES); glVertex2f( 0, -.5); glVertex2f( -.5, .5); glVertex2f( .5, .5); glEnd(); glFlush(); } (0,0) (-1,1) (-1,-1) (1,1) (1,-1)

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  • Translate , glTranslatef( dx, dy, dz);
  • Rotate, glRotatef(angle, x, y, z);
  • Scale, glScalef( sx, sy, sz);
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glColor3f(1.0f, 0.7f, 0.0f);

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