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![Lighting
GLfloat LightDiffuse[]= { 1.0f, 1.0f, 1.0f, 1.0f }; // Diffuse Light Values
GLfloat LightAmbient[]= { 0.5f, 0.5f, 0.5f, 1.0f }; // Ambient Light Values
GLfloat LightPosition[]= { 0.0f, 0.0f, 2.0f, 1.0f }; // Light Position](https://image.slidesharecdn.com/openglstarterl02-140211134628-phpapp01/75/OpenGL-Starter-L02-27-2048.jpg)
![Lighting
GLfloat LightDiffuse[]= { 1.0f, 1.0f, 1.0f, 1.0f }; // Diffuse Light Values
GLfloat LightAmbient[]= { 0.5f, 0.5f, 0.5f, 1.0f }; // Ambient Light Values
glLightfv(GL_LIGHT1, GL_DIFFUSE, LightDiffuse); // Setup The Diffuse Light
glLightfv(GL_LIGHT1, GL_AMBIENT, LightAmbient); // Setup The Ambient Light
glLightfv(GL_LIGHT1, GL_POSITION,LightPosition); // Position The Light
GLfloat LightPosition[]= { 0.0f, 0.0f, 2.0f, 1.0f }; // Light Position](https://image.slidesharecdn.com/openglstarterl02-140211134628-phpapp01/75/OpenGL-Starter-L02-28-2048.jpg)
![Lighting
GLfloat LightDiffuse[]= { 1.0f, 1.0f, 1.0f, 1.0f }; // Diffuse Light Values
GLfloat LightAmbient[]= { 0.5f, 0.5f, 0.5f, 1.0f }; // Ambient Light Values
glLightfv(GL_LIGHT1, GL_DIFFUSE, LightDiffuse); // Setup The Diffuse Light
glLightfv(GL_LIGHT1, GL_AMBIENT, LightAmbient); // Setup The Ambient Light
glLightfv(GL_LIGHT1, GL_POSITION,LightPosition); // Position The Light
glEnable(GL_LIGHT1); // Enable Light One
GLfloat LightPosition[]= { 0.0f, 0.0f, 2.0f, 1.0f }; // Light Position](https://image.slidesharecdn.com/openglstarterl02-140211134628-phpapp01/75/OpenGL-Starter-L02-29-2048.jpg)
![Lighting
GLfloat LightAmbient[]= { 0.5f, 0.5f, 0.5f, 1.0f }; // Ambient Light Values
GLfloat LightDiffuse[]= { 1.0f, 1.0f, 1.0f, 1.0f }; // Diffuse Light Values
GLfloat LightPosition[]= { 0.0f, 0.0f, 2.0f, 1.0f }; // Light Position
if (keys['B']) // Is B Key Pressed And bp FALSE?
{
bp=TRUE; // If So, bp Becomes TRUE
blend =!blend; // Toggle blend TRUE / FALSE
if(blend) // Is blend TRUE?
{
glEnable(GL_BLEND); // Turn Blending On
glDisable(GL_DEPTH_TEST); // Turn Depth Testing Off
}
else // Otherwise
{
glDisable(GL_BLEND); // Turn Blending Off
glEnable(GL_DEPTH_TEST); // Turn Depth Testing On
}
}](https://image.slidesharecdn.com/openglstarterl02-140211134628-phpapp01/75/OpenGL-Starter-L02-30-2048.jpg)
![Simple Particle System
• glTexCoord2d();
typedef struct // Create A Structure For Particle
{
bool active; // Active (Yes/No)
float life; // Particle Life
float fade; // Fade Speed
float r; // Red Value
float g; // Green Value
float b; // Blue Value
float x; // X Position
float y; // Y Position
float z; // Z Position
float xi; // X Direction
float yi; // Y Direction
float zi; // Z Direction
float xg; // X Gravity
float yg; // Y Gravity
float zg; // Z Gravity
} particles; // Particles
particles particle[MAX_PARTICLES]; // Particle Array (Room For Particle Info)](https://image.slidesharecdn.com/openglstarterl02-140211134628-phpapp01/75/OpenGL-Starter-L02-73-2048.jpg)
Uploaded byMohammad Shaker
OpenGL Starter L02
The document provides an overview of various computer graphics and OpenGL concepts including cube maps, texture mapping, lighting, blending, shadowing, fog, blurring, cameras, clipping, reflection, particles systems, loaders for 3D objects, terrain generation, and sound engines. It also includes code snippets and explanations for implementing concepts like lighting, blending, shadow mapping, and simple particle systems in OpenGL. The document serves as a short introductory course covering essential topics for OpenGL graphics programming.
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OpenGL Starter L02
- 1. Mohammad Shaker Mohammadshaker.com mohammadshakergtr.wordpress.com OpenGLStarter Course @ZGTRShaker
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- 4. Cube Maps glBegin(GL_QUADS); // NegativeX glTexCoord3f(-1.0f, -1.0f, 1.0f); glVertex3f(-fExtent, -fExtent, fExtent); glTexCoord3f(-1.0f, -1.0f, -1.0f); glVertex3f(-fExtent, -fExtent, -fExtent); glTexCoord3f(-1.0f, 1.0f, -1.0f); glVertex3f(-fExtent, fExtent, -fExtent); glTexCoord3f(-1.0f, 1.0f, 1.0f); glVertex3f(-fExtent, fExtent, fExtent); …..
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- 10. Combining light andtexture
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- 21. Lighting - Types •Ambient Light: doesn’t come from any particular direction. It has an original source somewhere, but the rays of light have bounced around the room or scene and become directionless.
- 22. Lighting - Types •Diffuse Light: The diffuse part of an OpenGL light is the directional component that appears to come from a particular direction and is reflected off a surface with an intensity proportional to the angle at which the light rays strike the surface. Thus, the object surface is brighter if the light is pointed directly at the surface than if the light grazes the surface from a greater angle.
- 23. Lighting - Types •Specular light: Like diffuse light, specular light is a highly directional property, but it interacts more sharply with the surface and in a particular direction.
- 24. Lighting The per-vertex specular highlightis improved by using separate specular or a specular exponent texture.
- 25. Lighting • An unlitjet reflects no light.
- 26. Lighting The output fromthe completed AMBIENT sample program. The output from the AMBIENT program when the light source is cut in half.
- 27. Lighting GLfloat LightDiffuse[]= {1.0f, 1.0f, 1.0f, 1.0f }; // Diffuse Light Values GLfloat LightAmbient[]= { 0.5f, 0.5f, 0.5f, 1.0f }; // Ambient Light Values GLfloat LightPosition[]= { 0.0f, 0.0f, 2.0f, 1.0f }; // Light Position
- 28. Lighting GLfloat LightDiffuse[]= {1.0f, 1.0f, 1.0f, 1.0f }; // Diffuse Light Values GLfloat LightAmbient[]= { 0.5f, 0.5f, 0.5f, 1.0f }; // Ambient Light Values glLightfv(GL_LIGHT1, GL_DIFFUSE, LightDiffuse); // Setup The Diffuse Light glLightfv(GL_LIGHT1, GL_AMBIENT, LightAmbient); // Setup The Ambient Light glLightfv(GL_LIGHT1, GL_POSITION,LightPosition); // Position The Light GLfloat LightPosition[]= { 0.0f, 0.0f, 2.0f, 1.0f }; // Light Position
- 29. Lighting GLfloat LightDiffuse[]= {1.0f, 1.0f, 1.0f, 1.0f }; // Diffuse Light Values GLfloat LightAmbient[]= { 0.5f, 0.5f, 0.5f, 1.0f }; // Ambient Light Values glLightfv(GL_LIGHT1, GL_DIFFUSE, LightDiffuse); // Setup The Diffuse Light glLightfv(GL_LIGHT1, GL_AMBIENT, LightAmbient); // Setup The Ambient Light glLightfv(GL_LIGHT1, GL_POSITION,LightPosition); // Position The Light glEnable(GL_LIGHT1); // Enable Light One GLfloat LightPosition[]= { 0.0f, 0.0f, 2.0f, 1.0f }; // Light Position
- 30. Lighting GLfloat LightAmbient[]= {0.5f, 0.5f, 0.5f, 1.0f }; // Ambient Light Values GLfloat LightDiffuse[]= { 1.0f, 1.0f, 1.0f, 1.0f }; // Diffuse Light Values GLfloat LightPosition[]= { 0.0f, 0.0f, 2.0f, 1.0f }; // Light Position if (keys['B']) // Is B Key Pressed And bp FALSE? { bp=TRUE; // If So, bp Becomes TRUE blend =!blend; // Toggle blend TRUE / FALSE if(blend) // Is blend TRUE? { glEnable(GL_BLEND); // Turn Blending On glDisable(GL_DEPTH_TEST); // Turn Depth Testing Off } else // Otherwise { glDisable(GL_BLEND); // Turn Blending Off glEnable(GL_DEPTH_TEST); // Turn Depth Testing On } }
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- 42. Shadowing // Draw objectsin the scene, including base plane DrawModels(GL_TRUE); // Enable alpha test so that shadowed fragments are discarded glAlphaFunc(GL_GREATER, 0.9f); glEnable(GL_ALPHA_TEST); glLightfv(GL_LIGHT0, GL_AMBIENT, ambientLight); glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuseLight); // Set up shadow comparison glEnable(GL_TEXTURE_2D); glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE,GL_COMPARE_R_TO_TEXTURE); // Set up the eye plane for projecting the shadow map on the scene glEnable(GL_TEXTURE_GEN_S); glEnable(GL_TEXTURE_GEN_T); glEnable(GL_TEXTURE_GEN_R); glEnable(GL_TEXTURE_GEN_Q); …. DrawModels(GL_TRUE);
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- 73. Simple Particle System •glTexCoord2d(); typedef struct // Create A Structure For Particle { bool active; // Active (Yes/No) float life; // Particle Life float fade; // Fade Speed float r; // Red Value float g; // Green Value float b; // Blue Value float x; // X Position float y; // Y Position float z; // Z Position float xi; // X Direction float yi; // Y Direction float zi; // Z Direction float xg; // X Gravity float yg; // Y Gravity float zg; // Z Gravity } particles; // Particles particles particle[MAX_PARTICLES]; // Particle Array (Room For Particle Info)
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- 84. Shaders – GeometryShaders
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- 98. Sound Engine • Fmod •OpenAL • Others
- 99. End of aVery Short Intro to OpenGL
- 100. Take a Lookon my other courses @ http://www.slideshare.net/ZGTRZGTR Available courses to the date of this slide:
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