How to add 3D objects with scnbox

ELECTRO8888

@cvp I just reviewed the code you gave the other person, but I get errors I don’t know how to fix :(

cvp

@ELECTRO8888 The code at the end of here works

ELECTRO8888

@cvp Thx!! I will try it now :)

ELECTRO8888

@cvp hey, it works!! Thx so much!!! Although i can’t figure out what part of it makes the shapes, I am trying to make a game with Pythonista (3D) but, Idk how to make 3D shapes with this app

(Edit: what I meant was, if you don’t mind, could you please give me a line of code to make a 3D cube along with an explanation as of how it works?)

ELECTRO8888

@cvp NVM I figured it out, thx so much for the help!!!!!

(Edit: Sorry if that sounded rude.. I got a little excited that I found out how to make a cube and did caps)

cvp

@ELECTRO8888 sorry to answer so late but I wasn't at home, you'll get it tomorrow

ELECTRO8888

@cvp That is fine

ELECTRO8888

@cvp I do have one more question though... sorry.. I found some code while researching, and I can’t understand most of it XD are you okay with maybe putting some comments in it explaining it? Also could you please make it to where I can place a 2 in the level list for the finish as well as making it to where I can give it a different texture? I am so sorry for all of this, I don’t know much with Pythonista or this website, anyways, here is the code: ```

RayCast

Simple raycasting based renderer

Touch the left part to rotate, and touch the right part to move forward

Coded in a few hours during my holidays, July 2014, straight from my iPhone - thanks Pythonista !!!

Feel free to upgrade !

Enjoy !

Emmanuel ICART

eicart@momorprods.com

from scene import *
from math import *

rendering step - 1=best(slower)

RENDERING_STEP=1

level data

1 = wall, 0 = empty

level = [[1,1,1,1,1,1,1,1],
[1,1,1,1,0,0,1,1],
[1,1,1,1,1,0,0,1],
[1,1,1,0,0,1,0,1],
[1,1,1,0,0,1,0,1],
[1,1,1,0,1,1,0,1],
[1,1,1,0,0,0,0,1],
[1,1,1,1,1,1,1,1]]
LX=len(level[0])
LZ=len(level)
LN=len(level[2])

CellSize=107
scan=10

player

xo=CellSizeLX/2
zo=CellSizeLZ/2
no=CellSize*LN/2
angle=45.0
fov=80

class RayCastScene (Scene):
def setup(self):
# preload the texture
self.texture='plf:Ground_StoneMid'
self.texture1='plf:Tile_DoorOpen_mid'
self.screenWidth=int(self.size.w)
self.screenHeight=int(self.size.h)
self.xTouchStart=0
self.yTouchStart=0
load_image(self.texture)
load_image(self.texture1)
pass

def draw(self):
	global angle
	global xo
	global zo
	global no
	# This will be called for every frame (typically 60 times per second).

	# clear background 
	background(0, 0, 0)

	focale=0.5*self.screenWidth/tan(radians(fov/2))

	# compute each screen column
	for column in range(0,self.screenWidth,RENDERING_STEP):
		scan_angle=angle+((float(column)-self.screenWidth/2)*fov)/self.screenWidth
		c=cos(radians(scan_angle))
		s=sin(radians(scan_angle))
		if abs(c)<0.001:
			if c>0:
				c=0.001
			else:
				c=-0.001

		if abs(s)<0.001:
			if s>0:
				s=0.001
			else:
				s=-0.001

		t2=s/c
		t1=c/s
		ok1=True
		ok2=True

		#Initialization of ray casting
		pz1=t2*CellSize
		if c>0:
			px1=CellSize
			ini=0
		else:
			px1=-CellSize
			pz1=-pz1
			ini=CellSize-1

		xp1=ini+(((int)(xo/CellSize))*CellSize)
		zp1=zo+((xp1-xo)*pz1)/px1
		np1=ini+(((int)(xo/CellSize))*CellSize)

		px2=t1*CellSize
		if s>0:
			pz2=CellSize
			ini=0
		else:
			pz2=-CellSize
			px2=-px2
			ini=CellSize-1

		zp2=ini+(((int)(zo/CellSize))*CellSize)
		xp2=xo+((zp2-zo)*px2)/pz2
		np2=xo+((zp2-zo)*px2)/pz2

		#****** cast a ray for z walls ******
		compteur=0
		while True:
			xp1+=px1
			zp1+=pz1
			np1+=px1
			compteur+=1
			xd=(int)(xp1/CellSize) % LX
			zd=(int)(zp1/CellSize) % LZ
			nd=(int)(np1/CellSize) % LN
			if (xd<0): xd=0
			if (zd<0): zd=0

			if level[xd][zd] !=0 or compteur>=scan:
				break

		if (compteur==scan):ok1=False
		distance1=(xp1-xo)/c
		col1=(zp1 % CellSize)
		if (px1<=0): col1=CellSize-1-col1

		#****** cast a ray for x walls ****** 
		compteur=0
		while True:
			xp2+=px2
			zp2+=pz2
			compteur+=1
			xd=(int)(xp2/CellSize) % LX
			zd=(int)(zp2/CellSize) % LZ
			nd=(int)(np2/CellSize) % LN
			if (xd<0):xd=0
			if (zd<0):zd=0
			if level[xd][zd]!=0 or compteur>=scan: break

		if (compteur==scan): ok2=False
		distance2=(zp2-zo)/s
		col2=(xp2 % CellSize)
		if (pz2>=0):col2=CellSize-1-col2

		#Choose the nearest wall (x or z)
		if (distance1<distance2):
			distance=1+(distance1)
			colonne=col1
		else:
			distance=1+(distance2)
			colonne=col2

		if ok1 or ok2:
			# fix the fishbowl effect
			distance=distance*cos(radians(angle-scan_angle))

			#compute the wall screen height
			hauteur = ((CellSize*focale)/distance)

		# draw the column
		ximage=(colonne*128)/CellSize # 101 x 171 tile
		image(self.texture,column,(self.screenHeight-hauteur)/2,RENDERING_STEP,hauteur,ximage,0,RENDERING_STEP,171)


	# display fingers
	fill(1, 0, 0)
	for touch in list(self.touches.values()):
		ellipse(touch.location.x - 50, touch.location.y - 50, 100, 100)

		# rotation control
		if (touch.location.x<self.screenWidth/2):
			angle += 0.04*(touch.location.x-self.xTouchStart)
		else:
		# displacement control
			speed=(touch.location.y-self.yTouchStart)*0.04
			dx=speed*cos(radians(angle))
			dz=speed*sin(radians(angle))
			if level[int((xo+dx)/CellSize)][int(zo/CellSize)]!=0:dx=0
			if level[int(xo/CellSize)][int((zo+dz)/CellSize)]!=0:dz=0
			xo+=dx
			zo+=dz

def touch_began(self, touch):
	global angle
	self.angleStart=angle
	if touch.location.x<self.screenWidth/2:self.xTouchStart=touch.location.x
	else:
		self.yTouchStart=touch.location.y
	pass

def touch_moved(self, touch):
	pass

def touch_ended(self, touch):
	pass

run(RayCastScene(),LANDSCAPE)

* list item

cvp

@ELECTRO8888 Sorry, no answer today, time to go to sleep here in Belgium for an old guy 😢, but try this

from objc_util import *
import ctypes
import ui
import math
from ImageColor import getrgb

load_framework('SceneKit')

SCNView, SCNScene, SCNBox, SCNNode, SCNMaterial, SCNCamera, SCNLight, SCNAction, SCNLookAtConstraint = map(ObjCClass, ['SCNView', 'SCNScene', 'SCNBox', 'SCNNode', 'SCNMaterial', 'SCNCamera', 'SCNLight', 'SCNAction',  'SCNLookAtConstraint' ])

@on_main_thread
def demo():
    main_view = ui.View()
    main_view_objc = ObjCInstance(main_view)
    scene_view = SCNView.alloc().initWithFrame_options_(((0, 0),(main_view.width,main_view.height)), None).autorelease()
    scene_view.setAutoresizingMask_(18)
    scene_view.setAllowsCameraControl_(True)
    main_view_objc.addSubview_(scene_view)
    main_view.name = 'SceneKit Demo'
    
    scene = SCNScene.scene()
    scene_view.setScene_(scene)
    
    root_node = scene.rootNode()
    
    camera = SCNCamera.camera()
    camera_node = SCNNode.node()
    camera_node.setCamera(camera)
    camera_node.setPosition((-30,30,30))
    root_node.addChildNode_(camera_node) 
    
    geometry = SCNBox.boxWithWidth_height_length_chamferRadius_(10, 10, 10, 0)
     
    geometry_node = SCNNode.nodeWithGeometry_(geometry)
    root_node.addChildNode_(geometry_node)
    
    Materials = []
    colors = ['red','blue','green','yellow','orange','pink']
    for i in range(0,6):
      rgb = getrgb(colors[i])
      r,g,b = tuple(c/255.0 for c in rgb)
      Material = SCNMaterial.material()
      Material.contents =           ObjCClass('UIColor').colorWithRed_green_blue_alpha_(r,g,b,1.0)
      Materials.append(Material)
    geometry.setMaterials_(Materials)

    # Add a constraint to the camera to keep it pointing to the target geometry
    constraint = SCNLookAtConstraint.lookAtConstraintWithTarget_(geometry_node)
    constraint.gimbalLockEnabled = True
    camera_node.constraints = [constraint]
    
    light_node = SCNNode.node()
    light_node.setPosition_((10, 0, -10))
    light = SCNLight.light()
    light.setType_('directional')
    light.setCastsShadow_(True)
    light.setColor_(UIColor.whiteColor().CGColor())
    light_node.setLight_(light)
    #root_node.addChildNode_(light_node)
    
    rotate_action = SCNAction.repeatActionForever_(SCNAction.rotateByX_y_z_duration_(0, math.pi*2, 0, 10))
    geometry_node.runAction_(rotate_action)
    
    main_view.present('full_screen')

demo()

cvp

@ELECTRO8888 I never use the Scene module, which is for 2d.
When you post here a script, try to include it between 2 lines of 3 backticks, using </> just under your topic title.
I've copied your code, corrected some indentations and put some # before comments lines like "level data" alone.
There was also two erroneous lines where the * was missing

xo=CellSize*LX/2
zo=CellSize*LZ/2

Anyway, the script works but the mathematical part has to be studied by your-self.
Good luck and welcome here

ELECTRO8888

@cvp Thx and okay and Thx!

JonB

The way they original Ray cast code worked, it traced a ray for each pixel until it hit a wall:

if level[xd][zd] !=0 or compteur>=scan:
                break

You would need to figure out which type of wall was hit (level[xd][yd]) then choose the texture that happens later based on that.

SmartGoat

@ELECTRO8888 would love to see how your game looks, I kept my project in mind but don’t have actually the energy to start it, and i’m really interested in how you’ll do it

ELECTRO8888

@SmartGoat Thx! That means a lot