I have an issue loading multiple .obj model in Python ModernGL.
It output this error: “_moderngl.Error: the buffer cannot be empty”
more exactly it gives this error:
Traceback (most recent call last):
File "C:Users---PycharmProjectsThingsmain.py", line 71, in <module>
app = GraphicsEngine()
^^^^^^^^^^^^^^^^
File "C:Users---PycharmProjectsThingsmain.py", line 39, in __init__
self.mesh = Mesh(self)
^^^^^^^^^^
File "C:Users---PycharmProjectsThingsmesh.py", line 8, in __init__
self.vao = VAO(app.ctx)
^^^^^^^^^^^^
File "C:Users---PycharmProjectsThingsvao.py", line 8, in __init__
self.vbo = VBO(ctx)
^^^^^^^^
File "C:Users---PycharmProjectsThingsvbo.py", line 11, in __init__
self.vbos['corbeau'] = CorbeauVBO(ctx)
^^^^^^^^^^^^^^^
File "C:Users---PycharmProjectsThingsvbo.py", line 97, in __init__
super().__init__(app)
File "C:Users---PycharmProjectsThingsvbo.py", line 20, in __init__
self.vbo = self.get_vbo()
^^^^^^^^^^^^^^
File "C:Users---PycharmProjectsThingsvbo.py", line 29, in get_vbo
vbo = self.ctx.buffer(vertex_data)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:Users---PycharmProjectsThings.venvLibsite-packagesmoderngl__init__.py", line 1795, in buffer
res.mglo, res._size, res._glo = self.mglo.buffer(data, reserve, dynamic)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_moderngl.Error: the buffer cannot be empty
The error occurs at line 29 in the vbo.py file: vbo = self.ctx.buffer(vertex_data) when loading the CorbeauVBO get_vertex_data function.
It is loading the first .obj file correctly, but not the Corbeau.obj file.
If you need others pieces of code or other information, ask me.
Line 28: print(f"get vbo = {vertex_data}") returns:
get vbo = [[ 0. 0. 0. 0. 1. -1. -1. 1.]
[ 1. 1. 0. 0. 1. 1. 1. 1.]
[ 0. 1. 0. 0. 1. -1. 1. 1.]
[ 0. 0. 0. 0. 1. -1. -1. 1.]
[ 1. 0. 0. 0. 1. 1. -1. 1.]
[ 1. 1. 0. 0. 1. 1. 1. 1.]
[ 0. 0. 1. 0. 0. 1. -1. 1.]
[ 1. 1. 1. 0. 0. 1. 1. -1.]
[ 0. 1. 1. 0. 0. 1. 1. 1.]
[ 0. 0. 1. 0. 0. 1. -1. 1.]
[ 1. 0. 1. 0. 0. 1. -1. -1.]
[ 1. 1. 1. 0. 0. 1. 1. -1.]
[ 0. 0. 0. 0. -1. 1. -1. -1.]
[ 1. 0. 0. 0. -1. -1. -1. -1.]
[ 1. 1. 0. 0. -1. -1. 1. -1.]
[ 1. 1. 0. 0. -1. -1. 1. -1.]
[ 0. 1. 0. 0. -1. 1. 1. -1.]
[ 0. 0. 0. 0. -1. 1. -1. -1.]
[ 1. 1. -1. 0. 0. -1. 1. 1.]
[ 0. 1. -1. 0. 0. -1. 1. -1.]
[ 0. 0. -1. 0. 0. -1. -1. -1.]
[ 1. 1. -1. 0. 0. -1. 1. 1.]
[ 0. 0. -1. 0. 0. -1. -1. -1.]
[ 1. 0. -1. 0. 0. -1. -1. 1.]
[ 0. 0. 0. 1. 0. -1. 1. 1.]
[ 1. 1. 0. 1. 0. 1. 1. -1.]
[ 0. 1. 0. 1. 0. -1. 1. -1.]
[ 0. 0. 0. 1. 0. -1. 1. 1.]
[ 1. 0. 0. 1. 0. 1. 1. 1.]
[ 1. 1. 0. 1. 0. 1. 1. -1.]
[ 0. 1. 0. -1. 0. -1. -1. 1.]
[ 1. 0. 0. -1. 0. 1. -1. -1.]
[ 1. 1. 0. -1. 0. 1. -1. 1.]
[ 0. 1. 0. -1. 0. -1. -1. 1.]
[ 0. 0. 0. -1. 0. -1. -1. -1.]
[ 1. 0. 0. -1. 0. 1. -1. -1.]]
for the first file, but get vbo = [] for the Corbeau.obj file.
in fact, line 104 print(f"obj corbo = {obj}") returns:
obj corbo = <pywavefront.material.Material object at 0x00000241FE966D80>
but line 107 print(f"vertex_corbo = {vertex_data}") returns: vertex_corbo = []
I’m French. So, sorry if I make errors or if I don’t understand what you say.
Here is my code:
vbo.py file:
import numpy as np
import moderngl as mgl
import pywavefront
class VBO:
def __init__(self, ctx):
self.vbos = {}
self.vbos['cube'] = CubeVBO(ctx)
self.vbos['cat'] = CatVBO(ctx)
self.vbos['corbeau'] = CorbeauVBO(ctx)
def destroy(self):
[vbo.destroy() for vbo in self.vbos.values()]
class BaseVBO:
def __init__(self, ctx):
self.ctx = ctx
self.vbo = self.get_vbo()
self.format: str = None
self.attribs: list = None
def get_vertex_data(self): ...
def get_vbo(self):
vertex_data = self.get_vertex_data()
print(f"get vbo = {vertex_data}")
vbo = self.ctx.buffer(vertex_data)
return vbo
def destroy(self):
self.vbo.release()
class CubeVBO(BaseVBO):
def __init__(self, ctx):
super().__init__(ctx)
self.format = '2f 3f 3f'
self.attribs = ['in_texcoord_0', 'in_normal', 'in_position']
@staticmethod
def get_data(vertices, indices):
data = [vertices[ind] for triangle in indices for ind in triangle]
return np.array(data, dtype='f4')
def get_vertex_data(self):
vertices = [(-1, -1, 1), ( 1, -1, 1), (1, 1, 1), (-1, 1, 1),
(-1, 1, -1), (-1, -1, -1), (1, -1, -1), ( 1, 1, -1)]
indices = [(0, 2, 3), (0, 1, 2),
(1, 7, 2), (1, 6, 7),
(6, 5, 4), (4, 7, 6),
(3, 4, 5), (3, 5, 0),
(3, 7, 4), (3, 2, 7),
(0, 6, 1), (0, 5, 6)]
vertex_data = self.get_data(vertices, indices)
tex_coord_vertices = [(0, 0), (1, 0), (1, 1), (0, 1)]
tex_coord_indices = [(0, 2, 3), (0, 1, 2),
(0, 2, 3), (0, 1, 2),
(0, 1, 2), (2, 3, 0),
(2, 3, 0), (2, 0, 1),
(0, 2, 3), (0, 1, 2),
(3, 1, 2), (3, 0, 1),]
tex_coord_data = self.get_data(tex_coord_vertices, tex_coord_indices)
normals = [( 0, 0, 1) * 6,
( 1, 0, 0) * 6,
( 0, 0,-1) * 6,
(-1, 0, 0) * 6,
( 0, 1, 0) * 6,
( 0,-1, 0) * 6,]
normals = np.array(normals, dtype='f4').reshape(36, 3)
vertex_data = np.hstack([normals, vertex_data])
vertex_data = np.hstack([tex_coord_data, vertex_data])
return vertex_data
class CatVBO(BaseVBO):
def __init__(self, app):
super().__init__(app)
self.format = '2f 3f 3f'
self.attribs = ['in_texcoord_0', 'in_normal', 'in_position']
def get_vertex_data(self):
objs = pywavefront.Wavefront('objects/cat/20430_Cat_v1_NEW.obj', cache=True, parse=True)
obj = objs.materials.popitem()[1]
vertex_data = obj.vertices
vertex_data = np.array(vertex_data, dtype='f4')
print(f"vertex_cat = {vertex_data}")
return vertex_data
class CorbeauVBO(BaseVBO):
def __init__(self, app):
super().__init__(app)
self.format = '2f 3f 3f'
self.attribs = ['in_texcoord_0', 'in_normal', 'in_position']
def get_vertex_data(self):
objs = pywavefront.Wavefront('objects/corbeau/Corbeau.obj', cache=True, parse=True)
obj = objs.materials.popitem()[1]
print(f"obj corbo = {obj}")
vertex_data = obj.vertices
vertex_data = np.array(vertex_data, dtype='f4')
print(f"vertex_corbo = {vertex_data}")
return vertex_data
Corbeau.obj file:
# Made in Blockbench 4.11.2
mtllib materials.mtl
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f 72/204/51 67/203/51 65/202/51 70/201/51
f 71/208/52 72/207/52 70/206/52 69/205/52
f 70/212/53 65/211/53 66/210/53 69/209/53
f 71/216/54 68/215/54 67/214/54 72/213/54
v 0.09375 0.125 0.06312499999999999
v 0.09375 0.125 0.06249999999999999
v 0.09375 0 0.06312499999999999
v 0.09375 0 0.06249999999999999
v 0.03125 0.125 0.06249999999999999
v 0.03125 0.125 0.06312499999999999
v 0.03125 0 0.06249999999999999
v 0.03125 0 0.06312499999999999
vt 0.4375 1
vt 0.46875 1
vt 0.46875 0.9375
vt 0.4375 0.9375
vt 0 1
vt 0 1
vt 0 0.9375
vt 0 0.9375
vt 0.4375 0.9375
vt 0.46875 0.9375
vt 0.46875 0.875
vt 0.4375 0.875
vt 0 1
vt 0 1
vt 0 0.9375
vt 0 0.9375
vt 0.03125 1
vt 0 1
vt 0 1
vt 0.03125 1
vt 0.03125 1
vt 0 1
vt 0 1
vt 0.03125 1
vn 0 0 -1
vn 1 0 0
vn 0 0 1
vn -1 0 0
vn 0 1 0
vn 0 -1 0
f 76/220/55 79/219/55 77/218/55 74/217/55
f 75/224/56 76/223/56 74/222/56 73/221/56
f 80/228/57 75/227/57 73/226/57 78/225/57
f 79/232/58 80/231/58 78/230/58 77/229/58
f 78/236/59 73/235/59 74/234/59 77/233/59
f 79/240/60 76/239/60 75/238/60 80/237/60
v 0.09375 0.000625 0.0625
v 0.09375 0.000625 0
v 0.09375 0 0.0625
v 0.09375 0 0
v 0.03125 0.000625 0
v 0.03125 0.000625 0.0625
v 0.03125 0 0
v 0.03125 0 0.0625
vt 0 1
vt 0.03125 1
vt 0.03125 1
vt 0 1
vt 0 1
vt 0.03125 1
vt 0.03125 1
vt 0 1
vt 0 1
vt 0.03125 1
vt 0.03125 1
vt 0 1
vt 0 1
vt 0.03125 1
vt 0.03125 1
vt 0 1
vt 0.125 0.5
vt 0.09375 0.5
vt 0.09375 0.53125
vt 0.125 0.53125
vt 0.5 0.90625
vt 0.46875 0.90625
vt 0.46875 0.875
vt 0.5 0.875
vn 0 0 -1
vn 1 0 0
vn 0 0 1
vn -1 0 0
vn 0 1 0
vn 0 -1 0
f 84/244/61 87/243/61 85/242/61 82/241/61
f 83/248/62 84/247/62 82/246/62 81/245/62
f 88/252/63 83/251/63 81/250/63 86/249/63
f 87/256/64 88/255/64 86/254/64 85/253/64
f 86/260/65 81/259/65 82/258/65 85/257/65
f 87/264/66 84/263/66 83/262/66 88/261/66
Can someone help me fix this error ?
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