The program below is the code we developed in Lesson 5. It is a Vpython program that creates a 3D model of a marble bouncing in a box.

from vpython import *
from time import *
mRadius=.5
wallThickness=.1
roomWidth=12
roomDepth=20
roomHeight=2
floor=box(pos=vector(0,-roomHeight/2,0),size=vector(roomWidth,wallThickness,roomDepth), color=color.white)
ceiling=box(pos=vector(0,roomHeight/2,0),size=vector(roomWidth,wallThickness,roomDepth), color=color.white)
backWall=box(pos=vector(0,0,-roomDepth/2),size=vector(roomWidth,roomHeight,wallThickness), color=color.white)
leftWall=box(pos=vector(-roomWidth/2,0,0),size=vector(wallThickness,roomHeight,roomDepth), color=color.white)
rightWall=box(pos=vector(roomWidth/2,0,0),size=vector(wallThickness,roomHeight,roomDepth), color=color.white)
marble=sphere(radius=mRadius,color=color.red)
deltaX=.1
deltaY=.1
deltaZ=.1

xPos=0
yPos=0
zPos=0

while True:
    rate(25)

    xPos=xPos+deltaX
    yPos=yPos+deltaY
    zPos=zPos+deltaZ

    Xrme=xPos+mRadius
    Xlme=xPos-mRadius
    Ytme=yPos+mRadius
    Ybme=yPos-mRadius
    Zbme=zPos-mRadius
    Zfme=zPos+mRadius

    Rwe=roomWidth/2-wallThickness/2
    Lwe=-roomWidth/2+wallThickness/2
    Cwe=roomHeight/2-wallThickness/2
    FLOORwe=-roomHeight/2+wallThickness/2
    Bwe=-roomDepth/2+wallThickness/2
    Fwe=roomDepth/2-wallThickness/2

    if (Xrme>=Rwe or Xlme<=Lwe):
        deltaX=deltaX*(-1)

    if (Ytme>=Cwe or Ybme<=FLOORwe):
        deltaY=deltaY*(-1)

    if (Zfme>=Fwe or Zbme<=Bwe):
        deltaZ=deltaZ*(-1)

    marble.pos=vector(xPos,yPos,zPos)

from vpython import *

from time import *

mRadius=.5

wallThickness=.1

roomWidth=12

roomDepth=20

roomHeight=2

floor=box(pos=vector(0,-roomHeight/2,0),size=vector(roomWidth,wallThickness,roomDepth), color=color.white)

ceiling=box(pos=vector(0,roomHeight/2,0),size=vector(roomWidth,wallThickness,roomDepth), color=color.white)

backWall=box(pos=vector(0,0,-roomDepth/2),size=vector(roomWidth,roomHeight,wallThickness), color=color.white)

leftWall=box(pos=vector(-roomWidth/2,0,0),size=vector(wallThickness,roomHeight,roomDepth), color=color.white)

rightWall=box(pos=vector(roomWidth/2,0,0),size=vector(wallThickness,roomHeight,roomDepth), color=color.white)

marble=sphere(radius=mRadius,color=color.red)

deltaX=.1

deltaY=.1

deltaZ=.1

xPos=0

yPos=0

zPos=0

while True:

rate(25)

xPos=xPos+deltaX

yPos=yPos+deltaY

zPos=zPos+deltaZ

Xrme=xPos+mRadius

Xlme=xPos-mRadius

Ytme=yPos+mRadius

Ybme=yPos-mRadius

Zbme=zPos-mRadius

Zfme=zPos+mRadius

Rwe=roomWidth/2-wallThickness/2

Lwe=-roomWidth/2+wallThickness/2

Cwe=roomHeight/2-wallThickness/2

FLOORwe=-roomHeight/2+wallThickness/2

Bwe=-roomDepth/2+wallThickness/2

Fwe=roomDepth/2-wallThickness/2

if (Xrme>=Rwe or Xlme<=Lwe):

deltaX=deltaX*(-1)

if (Ytme>=Cwe or Ybme<=FLOORwe):

deltaY=deltaY*(-1)

if (Zfme>=Fwe or Zbme<=Bwe):

deltaZ=deltaZ*(-1)

marble.pos=vector(xPos,yPos,zPos)

3D Graphics with Visual Python

Python 3D Graphics LESSON 4: Understanding 3D Motion in Visual Python Model

August 14, 2021 admin

In this lesson we show how to make an animated ball properly bounce off a wall using Visual Python (Vpython).

from vpython import *
from time import *
mRadius=2
wallThickness=1
roomWidth=15
roomDepth=12
roomHeight=8
floor=box(pos=vector(0,-roomHeight/2,0),size=vector(roomWidth,wallThickness,roomDepth), color=color.white)
ceiling=box(pos=vector(0,roomHeight/2,0),size=vector(roomWidth,wallThickness,roomDepth), color=color.white)
backWall=box(pos=vector(0,0,-roomDepth/2),size=vector(roomWidth,roomHeight,wallThickness), color=color.white)
leftWall=box(pos=vector(-roomWidth/2,0,0),size=vector(wallThickness,roomHeight,roomDepth), color=color.white)
rightWall=box(pos=vector(roomWidth/2,0,0),size=vector(wallThickness,roomHeight,roomDepth), color=color.white)
marble=sphere(radius=mRadius,color=color.red)
deltaX=.1
xPos=0
while True:
    rate(25)
    xPos=xPos+deltaX
    Xrme=xPos+mRadius
    Xlme=xPos-mRadius
    Rwe=roomWidth/2-wallThickness/2
    Lwe=-roomWidth/2+wallThickness/2
    if (Xrme>=Rwe or Xlme<Lwe):
        deltaX=deltaX*(-1)
    marble.pos=vector(xPos,0,0)

from vpython import *

from time import *

mRadius=2

wallThickness=1

roomWidth=15

roomDepth=12

roomHeight=8

floor=box(pos=vector(0,-roomHeight/2,0),size=vector(roomWidth,wallThickness,roomDepth), color=color.white)

ceiling=box(pos=vector(0,roomHeight/2,0),size=vector(roomWidth,wallThickness,roomDepth), color=color.white)

backWall=box(pos=vector(0,0,-roomDepth/2),size=vector(roomWidth,roomHeight,wallThickness), color=color.white)

leftWall=box(pos=vector(-roomWidth/2,0,0),size=vector(wallThickness,roomHeight,roomDepth), color=color.white)

rightWall=box(pos=vector(roomWidth/2,0,0),size=vector(wallThickness,roomHeight,roomDepth), color=color.white)

marble=sphere(radius=mRadius,color=color.red)

deltaX=.1

xPos=0

while True:

rate(25)

xPos=xPos+deltaX

Xrme=xPos+mRadius

Xlme=xPos-mRadius

Rwe=roomWidth/2-wallThickness/2

Lwe=-roomWidth/2+wallThickness/2

if (Xrme>=Rwe or Xlme<Lwe):

deltaX=deltaX*(-1)

marble.pos=vector(xPos,0,0)

Python

Faster Launch of WEBcam and Smoother Video in OpenCV on Windows

August 12, 2021 admin

This is the code we developed in Video Lesson #6 showing how to launch a webcam quicker and with less delay in OpenCV running on windows. The video above explains the code step by step, but for your convenience, I include the code below.

import cv2
print(cv2.__version__)
width=1280
height=720
cam=cv2.VideoCapture(1,cv2.CAP_DSHOW)
cam.set(cv2.CAP_PROP_FRAME_WIDTH, width)
cam.set(cv2.CAP_PROP_FRAME_HEIGHT,height)
cam.set(cv2.CAP_PROP_FPS, 30)
cam.set(cv2.CAP_PROP_FOURCC,cv2.VideoWriter_fourcc(*'MJPG'))
while True:
    ignore,  frame = cam.read()
    cv2.imshow('my WEBcam', frame)
    cv2.moveWindow('my WEBcam',0,0)
    if cv2.waitKey(1) & 0xff ==ord('q'):
        break
cam.release()

import cv2

print(cv2.__version__)

width=1280

height=720

cam=cv2.VideoCapture(1,cv2.CAP_DSHOW)

cam.set(cv2.CAP_PROP_FRAME_WIDTH, width)

cam.set(cv2.CAP_PROP_FRAME_HEIGHT,height)

cam.set(cv2.CAP_PROP_FPS, 30)

cam.set(cv2.CAP_PROP_FOURCC,cv2.VideoWriter_fourcc(*'MJPG'))

while True:

ignore, frame = cam.read()

cv2.imshow('my WEBcam', frame)

cv2.moveWindow('my WEBcam',0,0)

if cv2.waitKey(1) & 0xff ==ord('q'):

break

cam.release()

OpenCV, Python

Controlling a WEBcam in OpenCV on Windows

August 5, 2021 admin

In this lesson we show how to move a frame in OpenCV, how to convert a color image to grayscale, and then how to display multiple video windows. For your convenience, I include the code below that we develop in this video.

import cv2
print(cv2.__version__)
cam=cv2.VideoCapture(1)
while True:
    ignore,  frame = cam.read()
    gray=cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)
    cv2.imshow('my WEBcam', frame)
    cv2.moveWindow('my WEBcam',0,0)
    cv2.imshow('my grayFrame', gray)
    cv2.moveWindow('my grayFrame',640,0)

    cv2.imshow('my WEBcam2', frame)
    cv2.moveWindow('my WEBcam2',640,480)
    cv2.imshow('my grayFrame2', gray)
    cv2.moveWindow('my grayFrame2',0,480)
    

    if cv2.waitKey(1) & 0xff ==ord('q'):
        break
cam.release()

import cv2

print(cv2.__version__)

cam=cv2.VideoCapture(1)

while True:

ignore, frame = cam.read()

gray=cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)

cv2.imshow('my WEBcam', frame)

cv2.moveWindow('my WEBcam',0,0)

cv2.imshow('my grayFrame', gray)

cv2.moveWindow('my grayFrame',640,0)

cv2.imshow('my WEBcam2', frame)

cv2.moveWindow('my WEBcam2',640,480)

cv2.imshow('my grayFrame2', gray)

cv2.moveWindow('my grayFrame2',0,480)

if cv2.waitKey(1) & 0xff ==ord('q'):

break

cam.release()

3D Graphics with Visual Python

Python 3D Graphics LESSON 3: Parameterizing your 3D Model

August 4, 2021 admin

In this lesson we show you the importance of building a parameterized model for your 3D graphics in Python using Visual Python. You can manage large scenes unless you are doing it with parameterized dimensions. The video above takes you through it step by step. Here is the code for the parameterized box and marble we developed in Lesson 3:

from vpython import *
from time import *
mRadius=.75
wallThickness=.1
roomWidth=10
roomDepth=5
roomHeight=10
floor=box(pos=vector(0,-roomHeight/2,0),size=vector(roomWidth,wallThickness,roomDepth), color=color.white)
ceiling=box(pos=vector(0,roomHeight/2,0),size=vector(roomWidth,wallThickness,roomDepth), color=color.white)
backWall=box(pos=vector(0,0,-roomDepth/2),size=vector(roomWidth,roomHeight,wallThickness), color=color.white)
leftWall=box(pos=vector(-roomWidth/2,0,0),size=vector(wallThickness,roomHeight,roomDepth), color=color.white)
rightWall=box(pos=vector(roomWidth/2,0,0),size=vector(wallThickness,roomHeight,roomDepth), color=color.white)
marble=sphere(radius=mRadius,color=color.red)
deltaX=.1
xPos=0
while True:
    rate(10)
    xPos=xPos+deltaX
    if (xPos>roomWidth/2 or xPos<-roomWidth/2):
        deltaX=deltaX*(-1)
    marble.pos=vector(xPos,0,0)

from vpython import *

from time import *

mRadius=.75

wallThickness=.1

roomWidth=10

roomDepth=5

roomHeight=10

floor=box(pos=vector(0,-roomHeight/2,0),size=vector(roomWidth,wallThickness,roomDepth), color=color.white)

ceiling=box(pos=vector(0,roomHeight/2,0),size=vector(roomWidth,wallThickness,roomDepth), color=color.white)

backWall=box(pos=vector(0,0,-roomDepth/2),size=vector(roomWidth,roomHeight,wallThickness), color=color.white)

leftWall=box(pos=vector(-roomWidth/2,0,0),size=vector(wallThickness,roomHeight,roomDepth), color=color.white)

rightWall=box(pos=vector(roomWidth/2,0,0),size=vector(wallThickness,roomHeight,roomDepth), color=color.white)

marble=sphere(radius=mRadius,color=color.red)

deltaX=.1

xPos=0

while True:

rate(10)

xPos=xPos+deltaX

if (xPos>roomWidth/2 or xPos<-roomWidth/2):

deltaX=deltaX*(-1)

marble.pos=vector(xPos,0,0)

Technology Tutorials

Python 3D Graphics Tutorial 5: Bouncing Ball Simulation in Visual Python

Python 3D Graphics LESSON 4: Understanding 3D Motion in Visual Python Model

Faster Launch of WEBcam and Smoother Video in OpenCV on Windows

Controlling a WEBcam in OpenCV on Windows

Python 3D Graphics LESSON 3: Parameterizing your 3D Model

Making The World a Better Place One High Tech Project at a Time. Enjoy!