app.py

import gradio as gr
import pickle
from datasets import load_dataset
from plaid.containers.sample import Sample


import numpy as np
import pyrender
from trimesh import Trimesh
import matplotlib as mpl
import matplotlib.cm as cm

import os
# switch to "osmesa" or "egl" before loading pyrender
os.environ["PYOPENGL_PLATFORM"] = "egl"


# os.system("wget https://zenodo.org/records/10124594/files/Tensile2d.tar.gz")
# os.system("tar -xvf Tensile2d.tar.gz")

hf_dataset = load_dataset("PLAID-datasets/Tensile2d", split="all_samples")

nb_samples = 500

field_names_train = ["sig11", "sig22", "sig12", "U1", "U2", "q"]

_HEADER_ = '''
<h2><b>Visualization demo of <a href='https://huggingface.co/datasets/PLAID-datasets/Tensile2d' target='_blank'><b>Tensile2d dataset</b></b></h2>
'''


def sample_info(sample_id_str, fieldn):

    sample_ = hf_dataset[int(sample_id_str)]["sample"]
    plaid_sample = Sample.model_validate(pickle.loads(sample_))
    # plaid_sample = Sample.load_from_dir(f"Tensile2d/dataset/samples/sample_"+str(sample_id_str).zfill(9))

    nodes = plaid_sample.get_nodes()
    field = plaid_sample.get_field(fieldn)
    if nodes.shape[1] == 2:
        nodes__ = np.zeros((nodes.shape[0],nodes.shape[1]+1))
        nodes__[:,:-1] = nodes
        nodes = nodes__


    triangles = plaid_sample.get_elements()['TRI_3']

    # generate colormap
    if np.linalg.norm(field) > 0:
        norm = mpl.colors.Normalize(vmin=np.min(field), vmax=np.max(field))
        cmap = cm.coolwarm
        m = cm.ScalarMappable(norm=norm, cmap=cmap)
    
        vertex_colors = m.to_rgba(field)[:,:3]
    else:
        vertex_colors = 1+np.zeros((field.shape[0], 3))
        vertex_colors[:,0] = 0.2298057
        vertex_colors[:,1] = 0.01555616
        vertex_colors[:,2] = 0.15023281

    # generate mesh
    trimesh = Trimesh(vertices = nodes, faces = triangles)
    trimesh.visual.vertex_colors = vertex_colors
    mesh = pyrender.Mesh.from_trimesh(trimesh, smooth=False)

    # compose scene
    scene = pyrender.Scene(ambient_light=[.1, .1, .3], bg_color=[0, 0, 0])
    camera = pyrender.PerspectiveCamera( yfov=np.pi / 3.0)
    light = pyrender.DirectionalLight(color=[1,1,1], intensity=1000.)

    scene.add(mesh, pose=  np.eye(4))
    scene.add(light, pose=  np.eye(4))

    scene.add(camera, pose=[[ 1,  0,  0,  0],
                            [ 0,  1,  0,  0],
                            [ 0,  0,  1,  3],
                            [ 0,  0,  0,  1]])

    # render scene
    r = pyrender.OffscreenRenderer(1024, 1024)
    color, _ = r.render(scene)
    

    
    str__ = f"Training sample {sample_id_str}\n"
    str__ += str(plaid_sample)+"\n"
    
    if len(hf_dataset.description['in_scalars_names'])>0:        
        str__ += "\ninput scalars:\n"
        for sname in hf_dataset.description['in_scalars_names']:
            str__ += f"- {sname}: {plaid_sample.get_scalar(sname)}\n"
    if len(hf_dataset.description['out_scalars_names'])>0:        
        str__ += "\noutput scalars:\n"
        for sname in hf_dataset.description['out_scalars_names']:
            str__ += f"- {sname}: {plaid_sample.get_scalar(sname)}\n"
    str__ += f"\n\nMesh number of nodes: {nodes.shape[0]}\n"
    if len(hf_dataset.description['in_fields_names'])>0:        
        str__ += "\ninput fields:\n"
        for fname in hf_dataset.description['in_fields_names']:
            str__ += f"- {fname}\n"
    if len(hf_dataset.description['out_fields_names'])>0:        
        str__ += "\noutput fields:\n"
        for fname in hf_dataset.description['out_fields_names']:
            str__ += f"- {fname}\n"

    return str__, color


if __name__ == "__main__":

    with gr.Blocks() as demo:
        gr.Markdown(_HEADER_)
        with gr.Row(variant="panel"):
            with gr.Column():
                d1 = gr.Slider(0, nb_samples-1, value=0, label="Training sample id", info="Choose between 0 and "+str(nb_samples-1))
                output1 = gr.Text(label="Training sample info")
            with gr.Column():
                d2 = gr.Dropdown(field_names_train, value=field_names_train[0], label="Field name")        
                output2 = gr.Image(label="Training sample visualization")
                
        d1.input(sample_info, [d1, d2], [output1, output2])
        d2.input(sample_info, [d1, d2], [output1, output2]) 

    demo.launch()