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A Taste of Virtual Environment Development - SVE. Amy Ulinski Raj Inugala. Overview. What are Virtual Environments? Displays What is SVE? Steps to making first SVE program Demo Example Fun things you can do. What are Virtual Environments?. Modeling. Displays. Displays cont…. - PowerPoint PPT Presentation
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A Taste of Virtual Environment Development - SVE
Amy Ulinski
Raj Inugala
Overview
• What are Virtual Environments?
• Displays
• What is SVE?
• Steps to making first SVE program
• Demo Example
• Fun things you can do
What are Virtual Environments?
Modeling
Displays
Displays cont…
What is SVE?
• Simple Virtual Environment library– Easy creation of simple Virtual Environment
(VE) applications– Provide system of functions, event handlers
and 3D description of a Virtual World – Allows use of devices– Device-independent
Scene Graph
World
Table
UserRoom
Chair
•Nodes contain information about geometry, appearance, behavior, etc. of objects.
•Place Holder Objects
•Edges between nodes usually represent coordinate transformations between two coordinate systems
Scene Graph of an Environment
Room
Door Table Chair
Vase
Different Types of Representation
Table top
LegLeg Leg
LegTable top
Leg Leg Leg
Leg
TableVase
What happens to the table if you move a leg?
What happens to the table if you move the vase?
What happens to the vase if you move the table?
Don’t Call Us… We’ll Call You
• App initializes SVE system • Registers “callback” • Sve system gains control again
My First SVE Program
• Create an environment (3DS Max, Maya, Bryce, etc…)
• Export a .obj and .mtl file– Some software will convert for you
ie. Deep Explorations
.objmtllib office4.mtl
# object floor g floor v 3.95775e-005 -0.00473949 -0.00475565 v 4.20004 -0.00473949 -0.00475565
v 3.95775e-005 -0.00473922 -4.50476 v 4.20004 -0.00473922 -4.50476 v 3.95775e-005 0.00526051 -0.00475565 v 4.20004 0.00526051 -0.00475565 v 3.95775e-005 0.00526077 -4.50476 v 4.20004 0.00526077 -4.50476 # 8 verticies vt 1 0 vt 1 1 vt 0 1 vt 0 0
# 4 texture verticies vn 0 -1 -5.96046e-008 vn 0 1 5.96046e-008 vn 0 -4.65661e-008 1 vn 1 -3.94746e-014 0 vn 1 0 0 vn 1 -7.89492e-014 0 vn 0 0 -1 vn -1 0 0 # 8 normals usemtl Fabric_Blue_Carpet f 1/1/1 3/2/1 4/3/1 2/4/1 f 5/4/2 6/1/2 8/2/2 7/3/2 f 1/4/3 2/1/3 6/2/3 5/3/3 f 2/4/4 4/1/5 8/2/4 6/3/6 f 4/4/7 3/1/7 7/2/7 8/3/7 f 3/4/8 1/1/8 5/2/8 7/3/8
.mtl
newmtl Fabric_Blue_Carpet Ka 0 0 0 Kd 0.231373 0.231373 0.392157 Ks 0.9 0.9 0.9 illum 2 Ns 2.14355 map_Kd Carptblu.bmp map_bump Carptblu.bmp bump Carptblu.bmp
.worldSimple Virtual Object File Format version 2.0
object: meadow
description file: hello_world.objmove to 0 0 0children {
object: floor description file: myfloor.obj scale by 1.1 along y move to 0.0 0.5 -3.0
}
Loading World into SVE#include "sve.h"
main(int argc, char *argv[]) {
SVE_config config = SVE_NORMAL; //setting the configuration to normal
SVE_init("Example1 (sve)", config, &argc, argv); //initializes SVE system
if(!SVE_loadWorld(“example1.world")){ SVE_done(); //quit SVE}
SVE_beginEventLoop(); //SVE system gains control of program
SVE_done();
}
Simple Example
• demo
Manipulating Objects
• Must locate object in object treeSVE_object cube = SVE_findWorldObject("cube");
• Examples:
SVE_rotateObject(cube, 3, 'y');
SVE_changeObjectName(cube,"cube3");
SVE_setNewObjectPosition(cube,newPosition);
SVE_translateObjectGlobal(cube,0.2,0.4,0.5);
SVE_scaleObject(cube, 0.1, 0.0,0.0);
LIGHTINGSimple Virtual Primitive File Format version 1.1number of components: 2
component 1 type: lightData of component 1:no of attributes:3color 0.8 0.8 0.8local-light TRUEposition 10.0 10.0 10.0
component 2 type: lightData of component 2:no of attributes:2color 0.8 0.8 0.8position 0.0 1.0 0.0
SOUND
• Open Sound– int sound =
SVE_audioOpenSound("belltree_up2.wav");
• Play Sound– SVE_audioReplaySound(sound, TRUE);– SVE_audioStopSound(sound);
MORE DEMOS…
Questions ???