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use std::path::{Path, PathBuf};
use std::process::Command;
pub static EXPORT_BLENDER_DATA: &'static str = r#"
import bpy
bpy.context.view_layer.objects.active = None
# Get the objects at the beginning so that we don't iterate over new ones that we
# generate such as ik-to-fk converted rigs
objects = list(bpy.context.scene.objects)
for obj in objects:
bpy.context.view_layer.objects.active = obj
if obj.type == 'MESH':
bpy.ops.import_export.mesh2json()
if obj.type == 'ARMATURE':
bpy.ops.rigging.iktofk()
bpy.ops.import_export.armature2json()
"#;
pub fn export_blender_data(blender_files: &[PathBuf]) -> Result<String, anyhow::Error> {
let mut blender_process = Command::new("blender");
let blender_process = blender_process.arg("--background");
for blender_file in blender_files {
blender_process
.arg("-noaudio")
.args(&["--python-expr", &open_blender_file(blender_file)])
.args(&["--python-expr", &EXPORT_BLENDER_DATA]);
}
let output = blender_process.output().unwrap();
if output.stderr.len() > 0 {
return Err(BlenderExportError::Stderr(String::from_utf8(
output.stderr,
)?))?;
}
Ok(String::from_utf8(output.stdout)?)
}
fn open_blender_file(file: &dyn AsRef<Path>) -> String {
format!(
r#"
import bpy
bpy.ops.wm.open_mainfile(filepath="{}")
"#,
file.as_ref().to_str().unwrap()
)
}
#[derive(Debug, thiserror::Error)]
#[allow(missing_docs)]
pub enum BlenderExportError {
#[error("Error while exporting data from blender: {0}")]
Stderr(String),
}