Lecture 4

Text, Textures, Files, and Engines

contains notes and images from:

Chapter 6 and 7 and 11 and 13 of Inventor Mentor

Choose first presentation dates

Simple Shapes

• Cone
• Cube
• Cylinder
• Sphere

#include <Inventor/nodes/SoCone.h>
#include <Inventor/nodes/SoCube.h>
#include <Inventor/nodes/SoCylinder.h>
#include <Inventor/nodes/SoSphere.h>

SoCube * cub = new SoCube;
cub->width = 2;
cub->height= = 2;
cub->depth = 2;

SoCylinder * cyl = new SoCylinder;
cyl->height = 10;
cyl->radius = 2;
cyl->parts = SoCylinder::ALL; // ALL, SIDES, TOP, BOTTOM

SoSphere * sph = new SoSphere;
sph->radius = 4.5;

SoCone * con = new SoCone;
con->bottomRadius = 1.2
con->height = 4.0
con->parts = SoCone::ALL; // ALL, SIDES, BOTTOM

SoSphere * sph = new SoSphere;

Cone {

parts ALL

bottomRadius 1

height 2

}

Cube {

width 2

height 2

depth 2

}

Cylinder {

parts ALL

radius 1

height 2

}

Sphere {

radius 1

}

Textures

• Texture2

#include <Inventor/nodes/SoTexture2.h>

SoTexture2 * tex = new SoTexture2;
tex->filename.setValue("whatever.rgb");
tex->model = SoTexture2::MODULATE; // MODULATE, DECAL, BLEND

Texture2 {

filename "whatever.rgb"

model MODULATE

}

Files

#include <Inventor/nodes/SoFile.h>

SoSeparator * readFile(const char *filename)
{
char textBuffer[80];

//////////////////////
// Open the input file
///////////////////////

SoInput mySceneInput;
if (!mySceneInput.openFile(filename))
{
sprintf(textBuffer, "Cannot open file %s\n", filename);
showError(textBuffer);
return NULL;
}

////////////////////////////////////////
// Read the whole file into the database
////////////////////////////////////////

SoSeparator *myGraph = SoDB::readAll(&mySceneInput);
if (myGraph == NULL)
{
sprintf(textBuffer, "Problem reading file %s\n", filename);
showError(textBuffer);
return NULL;
}

mySceneInput.closeFile();
return myGraph;
}

File {
name "filename.iv"
}

Text

• Text2 - screen aligned, rotation and scale have no effect, uses current material, no textures, no lighting
• Text3 - can rotate, scale, light, and texture

#include <Inventor/nodes/SoText2.h>
#include <Inventor/nodes/SoText3.h>

SoText2 * tex = new SoText2;
tex->string.setValue("whatever");
tex->spacing = 1;
tex->justification = SoText2::LEFT; // LEFT, CENTER, RIGHT

SoText3 * tex = new SoText3;
tex->string.setValue("whatever");
tex->spacing = 1;
tex->justification = SoText2::LEFT; // LEFT, CENTER, RIGHT
tex->part = SoText2::ALL; // FRONT, BACK, SIDES, ALL

Text2 {

string ""
spacing 1
justification LEFT
}

Text3 {

string ""
spacing 1
justification LEFT
parts ALL
}

Engines

• Rotor
• Pendulum
• Shuttle
• Blinker

#include <Inventor/nodes/SoRotor.h>
#include <Inventor/nodes/SoPendulum.h>
#include <Inventor/nodes/SoShuttle.h>
#include <Inventor/nodes/SoBlinker.h>

SoRotor * rot = new SoRotor;
SoPendulum * pen = new SoPendulum;
SoShuttle * shu = new SoShuttle;
SoBlinker * blin = new SoBlinker;

rot->rotation.setValue(SbVec3f(0, 1, 0), 3.14);
rot->speed = 4;

pen->rotation0.setValue(SbVec3f(0, 0, 1), 0.15);
pen->rotation1.setValue(SbVec3f(0, 0, -1), 0.15);
pen->speed = 0.04;

shu->translation0.setValue( -0.25, 0, 0);
shu->translation1.setValue(0.25, 0, 0);
shu->speed = 0.02;

blin->speed = 2; // 2 times per second

Shuttle {
translation 0.161366 0 0
translation0 -0.25 0 0
translation1 0.25 0 0
speed 0.02
}

Pendulum {
rotation 0 0 1 0.0108086
rotation0 0 0 1 0.15
rotation1 0 0 -1 0.15
speed 0.04
on TRUE
}

Rotor {
rotation 0 0 1 0
speed 1
on TRUE
}

Blinker {
whichChild -1
speed 1
on TRUE
}

Coming Next Time

The Beginning of the Rest of the Course - Videogames