# GLBasic forum

## Main forum => GLBasic - en => Topic started by: Eric.Erpelding on 2016-Aug-22

Title: Revolving 3D Vector using GLBasic
Post by: Eric.Erpelding on 2016-Aug-22
This is my first attempt at making a 3D representation of a revolving vector using GLBasic.
Actually, it is my first attempt at writing any kind of 3D graphics program.
The code is very simple and will be the basis for further development.
Specific parameter values have been hard coded into this version just to get something working.

Code: (glbasic) [Select]
// --------------------------------- //
// Project: Revolving Arrow Vector
// Start: Sunday, August 21, 2016
// IDE Version: 14.001

GLOBAL cone, cylinder
GLOBAL phi

ArrowShaftColor = RGB(255, 153,51)

// object numbers
cone = 0
cylinder=1

// CreateCone: num, r, h, n, col

// CreateCylinder: num, r, h, n, col
CreateCylinder(cylinder,3,50, 20, ArrowShaftColor)

WHILE TRUE
INC phi, 1.
X_MAKE3D 1,1000,45

X_CAMERA 100,75,100, 0,25,0

X_MOVEMENT 0,0,0

// Draw co-ordinate axis
X_LINE 0,0,0,100,0,0,5,RGB(0,0,255)
X_LINE 0,0,0,0,100,0,5,RGB(0,0,255)
X_LINE 0,0,0,0,0,100,5,RGB(0,0,255)

// Draw rotated arrow vector
X_ROTATION 45, COS(phi),0,-SIN(phi)
X_DRAWOBJ cylinder,0
X_MOVEMENT 50*COS(45)*SIN(phi),50*SIN(45),50*COS(45)*COS(phi)
X_ROTATION 45, COS(phi),0,-SIN(phi)
X_DRAWOBJ cone,0

SHOWSCREEN
WEND

// ------------------------------------------------------------- //
// -=#  CONE  #=-
// ------------------------------------------------------------- //
FUNCTION CreateCone: num, r, h, n, col
LOCAL i,j,theta,pi
pi = ACOS(0)*2
IF r < 0 THEN r = -r
IF n < 4 THEN n = 4

X_AUTONORMALS 2
X_OBJSTART num
FOR i=0 TO n
theta = i * 2*pi / n;
X_OBJADDVERTEX   0, h, 0, 0, 0, col
theta = (i+1)*2*pi/n
X_OBJNEWGROUP

NEXT
X_OBJEND
ENDFUNCTION

// ------------------------------------------------------------- //
// -=#  CYLINDER  #=-
// ------------------------------------------------------------- //
FUNCTION CreateCylinder: num, r, h, n, col
LOCAL i,j,theta,pi
pi = ACOS(0)*2
IF r < 0 THEN r = -r
IF n < 4 THEN n = 4

X_AUTONORMALS 2
X_OBJSTART num
FOR i=0 TO n
theta = i * 2*pi / n;
theta = (i+1)*2*pi/n