deblender

#!/bin/sh

# Usage: ./deblender model.obj [x_trans] [y_trans] [z_trans]
# Example: ./deblender cube.obj 0 -0.5 0

if [ $# -eq 0 ]; then
    echo "No input file provided."
    exit 1
fi

if [ ! -f "$1" ]; then
    echo "$1 doesn't exist or is not a file."
    exit 1
fi

# Capture arguments (default to 0 if not provided)
TX=${2:-0}
TY=${3:-0}
TZ=${4:-0}

# Process Vertices
echo "point3d_t vs[] = {"
grep "^v " < "$1" | awk -v tx="$TX" -v ty="$TY" -v tz="$TZ" '{
    printf "    {.x = %.6f, .y = %.6f, .z = %.6f},\n", $2 + tx, $3 + ty, $4 + tz
}'
echo "};"

# Process Faces
echo "fs_t fs[] = {"
grep "^f " < "$1" | awk '
{
    # Collect vertex indices from the line (handling v/vt/vn formats)
    delete face;
    idx_count = 0;
    
    for (i = 2; i <= NF; i++) {
        split($i, parts, "/");
        # convert from 1-based to 0-based
        idx_count++;
        face[idx_count] = parts[1] - 1;
    }

    # Triangulate: fan from first vertex (index 1 in our 1-based awk array)
    for (i = 2; i < idx_count; i++) {
        print "    FSN(" face[1] ", " face[i] ", " face[i+1] "),";
    }
}'
echo "};"