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from pathlib import Path
from typing import Any
import gradio as gr
from PIL import Image
from stl_slicer import SliceStack, load_mesh, slice_stl_to_tiffs
ViewerState = dict[str, Any]
def _read_slice_preview(path: str) -> Image.Image:
with Image.open(path) as image:
return image.copy()
def _empty_state() -> ViewerState:
return {"tiff_paths": [], "z_values": []}
def _reset_slider() -> dict[str, Any]:
return gr.update(minimum=0, maximum=0, value=0, step=1, interactive=False)
def _stack_to_state(stack: SliceStack) -> ViewerState:
return {
"tiff_paths": [str(path) for path in stack.tiff_paths],
"z_values": stack.z_values,
}
def _format_summary(stack: SliceStack, source_name: str) -> str:
(x_min, y_min, z_min), (x_max, y_max, z_max) = stack.bounds
return "\n".join(
[
"### Slice Stack Ready",
f"- Source: `{source_name}`",
f"- TIFF count: `{len(stack.tiff_paths)}`",
f"- Image size: `{stack.image_size[0]} x {stack.image_size[1]}` pixels",
f"- Layer height: `{stack.layer_height}`",
f"- Pixel size: `{stack.pixel_size}`",
f"- Bounds: `x={x_min:.3f}..{x_max:.3f}`, `y={y_min:.3f}..{y_max:.3f}`, `z={z_min:.3f}..{z_max:.3f}`",
]
)
def _format_model_status(source_name: str) -> str:
return "\n".join(
[
"### Model Loaded",
f"- Source: `{source_name}`",
"- Rotate the model in the 3D viewer, then choose slice settings and generate the TIFF stack.",
]
)
def _format_model_details(source_name: str, mesh) -> str:
extents = mesh.extents
return "\n".join(
[
"### Model Details",
f"- Source: `{source_name}`",
f"- Extents: `{extents[0]:.3f} x {extents[1]:.3f} x {extents[2]:.3f}`",
f"- Faces: `{len(mesh.faces)}`",
f"- Vertices: `{len(mesh.vertices)}`",
f"- Watertight: `{'yes' if mesh.is_watertight else 'no'}`",
]
)
def _slice_label(state: ViewerState, index: int) -> str:
path = Path(state["tiff_paths"][index]).name
z_value = state["z_values"][index]
total = len(state["tiff_paths"])
return f"Slice {index + 1} / {total} | z = {z_value:.4f} | {path}"
def _render_selected_slice(state: ViewerState, index: int) -> tuple[str, Image.Image | None, str | None]:
tiff_paths = state.get("tiff_paths", [])
if not tiff_paths:
return "No slice stack loaded yet.", None, None
bounded_index = max(0, min(int(index), len(tiff_paths) - 1))
selected_path = tiff_paths[bounded_index]
return (
_slice_label(state, bounded_index),
_read_slice_preview(selected_path),
selected_path,
)
def load_model_assets(stl_file: str | None):
if not stl_file:
return (
"Upload an STL file to begin.",
_empty_state(),
_reset_slider(),
"No slice stack loaded yet.",
None,
None,
None,
None,
"No model loaded yet.",
)
mesh = load_mesh(stl_file)
source_name = Path(stl_file).name
return (
_format_model_status(source_name),
_empty_state(),
_reset_slider(),
"No slice stack loaded yet.",
None,
None,
None,
stl_file,
_format_model_details(source_name, mesh),
)
def generate_stack(
stl_file: str | None,
layer_height: float,
pixel_size: float,
progress: gr.Progress = gr.Progress(),
):
if not stl_file:
raise gr.Error("Upload an STL file before generating slices.")
def report_progress(current: int, total: int) -> None:
progress(current / total, desc=f"Rendering slice {current} of {total}")
stack = slice_stl_to_tiffs(
stl_file,
layer_height=layer_height,
pixel_size=pixel_size,
progress_callback=report_progress,
)
state = _stack_to_state(stack)
label, preview, selected_path = _render_selected_slice(state, 0)
slider_update = gr.update(
minimum=0,
maximum=max(0, len(stack.tiff_paths) - 1),
value=0,
step=1,
interactive=len(stack.tiff_paths) > 1,
)
return (
_format_summary(stack, Path(stl_file).name),
state,
slider_update,
label,
preview,
str(stack.zip_path),
selected_path,
)
def jump_to_slice(state: ViewerState, index: float) -> tuple[str, Image.Image | None, str | None]:
return _render_selected_slice(state, int(index))
def shift_slice(state: ViewerState, index: float, delta: int) -> tuple[int, str, Image.Image | None, str | None]:
tiff_paths = state.get("tiff_paths", [])
if not tiff_paths:
return 0, "No slice stack loaded yet.", None, None
new_index = max(0, min(int(index) + delta, len(tiff_paths) - 1))
label, preview, selected_path = _render_selected_slice(state, new_index)
return new_index, label, preview, selected_path
def build_demo() -> gr.Blocks:
with gr.Blocks(title="STL TIFF Slicer") as demo:
gr.Markdown(
"""
# STL to TIFF Slicer
Upload an STL to inspect it in a rotatable 3D viewer.
Then choose a layer height and XY pixel size, generate the TIFF stack, and browse the slices below.
"""
)
state = gr.State(_empty_state())
with gr.Row():
with gr.Column(scale=1):
stl_file = gr.File(
label="STL File",
file_types=[".stl"],
type="filepath",
)
layer_height = gr.Number(
label="Layer Height",
value=0.1,
minimum=0.0001,
step=0.01,
)
pixel_size = gr.Number(
label="Pixel Size",
value=0.05,
minimum=0.0001,
step=0.01,
)
generate_button = gr.Button("Generate TIFF Stack", variant="primary")
download_zip = gr.File(label="Download All TIFFs (ZIP)")
current_tiff = gr.File(label="Current TIFF Slice")
with gr.Column(scale=2):
summary = gr.Markdown("Upload an STL file to begin.")
model_details = gr.Markdown("No model loaded yet.")
model_viewer = gr.Model3D(
label="Interactive 3D Viewer",
display_mode="solid",
clear_color=(0.94, 0.95, 0.97, 1.0),
height=360,
)
slice_label = gr.Markdown("No slice stack loaded yet.")
slice_preview = gr.Image(
label="Slice Preview",
type="pil",
image_mode="L",
height=420,
)
with gr.Row():
prev_button = gr.Button("Previous Slice")
next_button = gr.Button("Next Slice")
slice_slider = gr.Slider(
label="Slice Index",
minimum=0,
maximum=0,
value=0,
step=1,
interactive=False,
)
stl_file.change(
fn=load_model_assets,
inputs=stl_file,
outputs=[
summary,
state,
slice_slider,
slice_label,
slice_preview,
download_zip,
current_tiff,
model_viewer,
model_details,
],
)
generate_button.click(
fn=generate_stack,
inputs=[stl_file, layer_height, pixel_size],
outputs=[
summary,
state,
slice_slider,
slice_label,
slice_preview,
download_zip,
current_tiff,
],
)
slice_slider.release(
fn=jump_to_slice,
inputs=[state, slice_slider],
outputs=[slice_label, slice_preview, current_tiff],
queue=False,
)
prev_button.click(
fn=lambda state_value, index: shift_slice(state_value, index, -1),
inputs=[state, slice_slider],
outputs=[slice_slider, slice_label, slice_preview, current_tiff],
queue=False,
)
next_button.click(
fn=lambda state_value, index: shift_slice(state_value, index, 1),
inputs=[state, slice_slider],
outputs=[slice_slider, slice_label, slice_preview, current_tiff],
queue=False,
)
return demo
demo = build_demo()
if __name__ == "__main__":
demo.launch(ssr_mode=False)
|