Object.LocalOrientation don't work(or am I dumb...)

Game Engine Game Engine Support and Discussion
1

Hello! I am using a list to get all objects in the scene that have “Grass” in their properties, to make a grass (not procedural, because I don’t know: (…). But when I apply “localOrientation” to each object on the list, they change their orientations in the same direction, and their orientations are different.The objects have an “arrow” on top because I was wondering if they changed for each other in different ways (and it worked …).
(Note: UPBGE Project)

video: https://youtu.be/04BhMXbViXA

Edit: The bad script…

import bge
import math
import mathutils
import random
from collections import OrderedDict

class grass(bge.types.KX_PythonComponent):
    args = OrderedDict([
        ("velocity", 0.0),
    ])
    
    def start(self, args):
        self.velocity = args["velocity"]
        
        self.x_z = 0.0
        self.y_z = 0.0
        
        self.timer = 0.0
        
        self.grass = [obj for obj in bge.logic.getCurrentScene().objects if "Grass" in obj.getPropertyNames()]
        self.tree = [obj for obj in bge.logic.getCurrentScene().objects if "Tree" in obj.getPropertyNames()]
        
        for gr in self.grass:
            gr.setParent(bge.logic.getCurrentScene().objects['Ground'])
            gr['Ori'] = random.uniform(0.0, 360.0)
            xyz = gr.localOrientation.to_euler()
            xyz[2] = math.radians(gr['Ori'])
            gr.localOrientation = xyz.to_matrix()
            
    def grass_logic(self):
        def ori():
            self.x_z = math.sin((self.object['Time']*self.velocity)/1.2)/5
            self.y_z = math.cos((self.object['Time']*self.velocity)/2.3)/5
            
            return(self.y_z, self.x_z)
        
        for gr in self.grass:
            gr.worldOrientation[0][2] = ori()[0]
            gr.worldOrientation[1][2] = ori()[1]
        for tr in self.tree:
            pass
    
    def update(self):
        self.grass_logic()
2

Hi @Markuebinha

So let me get this strait :thinking:
You want all the objects with grass property to face in the same direction :question:
Like at the beginning of the video in the Blender View-Port :question:

[ EDIT ]
After looking at your file I still don’t understand what you want to happen :question:

Random Rotations that are locally set :thinking: :question:

3

I want objects to have their local orientations shifted in different directions, since everyone today always shifts to the same side.

4

The script modifies the orientation of all objects in the list at random so that it does not become monotone. But when I used the time math.sin() to modify the local orientation of each object, they deform in the same direction, and that’s not what I want, I want them to change individually.

5

You can rotate clockwise or counterclockwise, that’s it.

dirn = random.uniform(0,1)
dirn = 1 if dirn < 0.5 else -1
xyz[2] = math.radians(gr['Ori'])*dirn
6

whats wrong with obj.applyRotation((x,y,z), True)?

EDIT:
WARNING: python is very slow, running code on each blade of grass will take a long time.

use a shader to warp the uv coords or otherwise displace the normals.

7

I don’t know how to make this, this is very hard for me…

EDIT:
I made this code, trying to change the position of the object mesh vertices, but nothing happens. If I put the position of the vertex on the console, it shows that its position changes, but visually, it doesn’t.

import bge
import math
import mathutils

cont = bge.logic.getCurrentController()
own = cont.owner

grass = [obj for obj in bge.logic.getCurrentScene().objects if "Grass" in obj.getPropertyNames()]
velocity = 5

def ori():
    x_z = math.sin((own['Time']*velocity)/1.2)/5
    y_z = math.cos((own['Time']*velocity)/2.3)/5
    
    return(y_z*10, x_z*10)

for gr in grass:
    vert_pos = [ori()[0],ori()[1],1.0]
    mesh = gr.meshes[0]
    
    for mat in range(len(mesh.materials)):
        for vet in range(mesh.getVertexArrayLength(mat)):
            vertex = mesh.getVertex(mat, vet)
            vertex_get_xyz = vertex.getXYZ()
            
            vertex_get_xyz[0] = vertex_get_xyz[0]+ori()[0]
            vertex_get_xyz[1] = vertex_get_xyz[1]+ori()[0]
            
            pos = mathutils.Vector((vertex_get_xyz[0],vertex_get_xyz[1],vertex_get_xyz[2]))
            pos.normalize()
            vertex.setXYZ(pos)
8

Er so this is what I get on my end when opening @Markuebinha’s blend file :thinking:

I see grass with rotation set to different rotations.
However it’s the same rotations every time.
@Markuebinha I think you are wanting ABSOLUTE_RANDOM* rotations per-init :question:

PS. I think I am the dumb one here . . . :slight_smile:

9

Yes, i want individuall random object rotations!

10

this is all you need to get them random oriented

import random

def test(cont):
    
    own = cont.owner
    grass = [obj for obj in own.scene.objects if "Grass" in obj]

    for obj in grass:
        obj.worldOrientation = [0,0,random.randint(1,360)]

http://s000.tinyupload.com/?file_id=04400480381132054668

11

Yeah! Mas eu preciso que o “vento” nas folhas também se mova em direções diferentes.

12

write in English please, most people wont understand what you write otherwise.

i put what you have written into google translate and got this.
“” Yeah! But I need the “wind” on the leaves to move in different directions as well. “”

13

So Sorry…
Can anyone help me?

14

Uh. Did @Cotaks’s script not work :question:

15

it’s simple, first set the rotation, then use the script to make wind.

16

Yes, but it’s something I had used before.

17

I want something like this: https://youtu.be/245Zv4AWXVM?t=56

18

I finally got a satisfactory result, got what I wanted using mesh.transformUV() and mesh.transform(). This results not bad, for me :smiley: Vertex_BGE_Test.blend (541.9 KB)