OpenGL Starter L02

Mohammad ShakerMohammadshaker.com mohammadshakergtr.wordpress.com

OpenGL Starter Course@ZGTRShaker

Cube Maps

Cube Maps

glBegin(GL_QUADS);// Negative XglTexCoord3f(-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);…..

Texture Mapping

FPSFrame Per Second

Lighting and Blending!

Combining light and texture

Lighting

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.

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.

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.

Lighting

The per-vertex specular highlight is improved by using separate specularor a specular exponent texture.

Lighting

• An unlit jet reflects no light.

Lighting

The output from the completed AMBIENT sample program.

The output from the AMBIENT program when the light source is cut in half.

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

Lighting



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


Lighting



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


Lighting

GLfloat LightAmbient[]= { 0.5f, 0.5f, 0.5f, 1.0f }; // Ambient Light ValuesGLfloat LightDiffuse[]= { 1.0f, 1.0f, 1.0f, 1.0f }; // Diffuse Light ValuesGLfloat 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 TRUEblend =!blend; // Toggle blend TRUE / FALSEif(blend) // Is blend TRUE?{

glEnable(GL_BLEND); // Turn Blending OnglDisable(GL_DEPTH_TEST); // Turn Depth Testing Off

}else // Otherwise{

glDisable(GL_BLEND); // Turn Blending OffglEnable(GL_DEPTH_TEST); // Turn Depth Testing On

}}

Blending

Blending

glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

Blending

Wire Framing

Shadowing

Shadowing

// Draw objects in the scene, including base planeDrawModels(GL_TRUE);

// Enable alpha test so that shadowed fragments are discardedglAlphaFunc(GL_GREATER, 0.9f);glEnable(GL_ALPHA_TEST);

glLightfv(GL_LIGHT0, GL_AMBIENT, ambientLight);glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuseLight);

// Set up shadow comparisonglEnable(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 sceneglEnable(GL_TEXTURE_GEN_S);glEnable(GL_TEXTURE_GEN_T);glEnable(GL_TEXTURE_GEN_R);glEnable(GL_TEXTURE_GEN_Q);….

DrawModels(GL_TRUE);

Depth Buffer

Fog

• Why Fog?!

Blurring

Dynamic environment mapping

Camera

Clipping

Reflection

Brightening

Blooming!

Antialiasing

Anitalysing

Particles System

Simple Particle System

• glTexCoord2d();

typedef struct // Create A Structure For Particle{

bool active; // Active (Yes/No)float life; // Particle Lifefloat fade; // Fade Speedfloat r; // Red Valuefloat g; // Green Valuefloat b; // Blue Valuefloat x; // X Positionfloat y; // Y Positionfloat z; // Z Positionfloat xi; // X Directionfloat yi; // Y Directionfloat zi; // Z Directionfloat xg; // X Gravityfloat yg; // Y Gravityfloat zg; // Z Gravity

} particles; // Particlesparticles particle[MAX_PARTICLES]; // Particle Array (Room For Particle Info)

LensFlare

Shaders

Shaders – Geometry Shaders

3D Object Loaders

Terrain

Height map

Sound Engines

Sound Engine

• Fmod

• OpenAL

• Others

End of a Very Short Intro to OpenGL

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OpenGL Starter L02

Education

Transcript of OpenGL Starter L02