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paint: add export_obj_run_sculpt

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This commit is contained in:
luboslenco
2026-04-24 13:15:00 +02:00
parent 6b1841014d
commit 2e8335ef88
2 changed files with 112 additions and 1 deletions
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paint/sources/export_mesh.c
+6 -1
View File
@@ -10,7 +10,12 @@ void export_mesh_run(char *path, mesh_object_t_array_t *paint_objects, bool appl
paint_objects = project_paint_objects;
}
if (g_context->export_mesh_format == MESH_FORMAT_OBJ) {
merge_vertices ? export_obj_run(path, paint_objects, apply_disp) : export_obj_run_fast(path, paint_objects);
if (merge_vertices) {
export_obj_run(path, paint_objects, apply_disp);
}
else {
export_obj_run_fast(path, paint_objects);
}
}
else if (g_context->export_mesh_format == MESH_FORMAT_GLB) {
#ifdef WITH_PLUGINS
paint/sources/export_obj.c
+106
View File
@@ -274,3 +274,109 @@ void export_obj_run_fast(char *path, mesh_object_t_array_t *paint_objects) {
}
iron_file_save_bytes(path, o, 0);
}
void export_obj_run_sculpt(char *path, mesh_object_t_array_t *paint_objects) {
slot_layer_t *l = NULL;
for (i32 i = 0; i < project_layers->length; ++i) {
if (project_layers->buffer[i]->texpaint_sculpt != NULL) {
l = project_layers->buffer[i];
break;
}
}
if (l == NULL) {
return;
}
u8_array_t *o = u8_array_create_from_raw((u8[]){}, 0);
export_obj_write_string(o, "# armorpaint.org\n");
mesh_object_t *p = paint_objects->buffer[0];
mesh_data_t *mesh = p->data;
f32 sc = mesh->scale_pos;
i16_array_t *texa = mesh->vertex_arrays->buffer[2]->values;
i32 len = math_floor(mesh->index_array->length);
i32 tris = math_floor(len / 3.0);
f32 inv = 1.0 / 32767.0;
buffer_t *pixels = gpu_get_texture_pixels(l->texpaint_sculpt);
export_obj_write_string(o, string("o %s\n", p->base->name));
for (i32 i = 0; i < len; ++i) {
f32 x = buffer_get_f32(pixels, i * 16) * sc;
f32 y = buffer_get_f32(pixels, i * 16 + 4) * sc;
f32 z = buffer_get_f32(pixels, i * 16 + 8) * sc;
export_obj_write_string(o, "v ");
export_obj_write_string(o, f32_to_string(x));
export_obj_write_string(o, " ");
export_obj_write_string(o, f32_to_string(z));
export_obj_write_string(o, " ");
export_obj_write_string(o, f32_to_string(-y));
export_obj_write_string(o, "\n");
}
for (i32 t = 0; t < tris; ++t) {
i32 i0 = t * 3, i1 = t * 3 + 1, i2 = t * 3 + 2;
f32 x0 = buffer_get_f32(pixels, i0 * 16) * sc;
f32 y0 = buffer_get_f32(pixels, i0 * 16 + 4) * sc;
f32 z0 = buffer_get_f32(pixels, i0 * 16 + 8) * sc;
f32 x1 = buffer_get_f32(pixels, i1 * 16) * sc;
f32 y1 = buffer_get_f32(pixels, i1 * 16 + 4) * sc;
f32 z1 = buffer_get_f32(pixels, i1 * 16 + 8) * sc;
f32 x2 = buffer_get_f32(pixels, i2 * 16) * sc;
f32 y2 = buffer_get_f32(pixels, i2 * 16 + 4) * sc;
f32 z2 = buffer_get_f32(pixels, i2 * 16 + 8) * sc;
f32 e1x = x1 - x0, e1y = y1 - y0, e1z = z1 - z0;
f32 e2x = x2 - x0, e2y = y2 - y0, e2z = z2 - z0;
f32 nx = e1y * e2z - e1z * e2y;
f32 ny = e1z * e2x - e1x * e2z;
f32 nz = e1x * e2y - e1y * e2x;
f32 nl = math_sqrt(nx * nx + ny * ny + nz * nz);
if (nl > 0.0) { nx /= nl; ny /= nl; nz /= nl; }
export_obj_write_string(o, "vn ");
export_obj_write_string(o, f32_to_string(nx));
export_obj_write_string(o, " ");
export_obj_write_string(o, f32_to_string(nz));
export_obj_write_string(o, " ");
export_obj_write_string(o, f32_to_string(-ny));
export_obj_write_string(o, "\n");
}
for (i32 i = 0; i < len; ++i) {
f32 u = texa->buffer[i * 2] * inv;
f32 v = 1.0 - texa->buffer[i * 2 + 1] * inv;
export_obj_write_string(o, "vt ");
export_obj_write_string(o, f32_to_string(u));
export_obj_write_string(o, " ");
export_obj_write_string(o, f32_to_string(v));
export_obj_write_string(o, "\n");
}
for (i32 t = 0; t < tris; ++t) {
i32 b = t * 3 + 1;
export_obj_write_string(o, "f ");
export_obj_write_string(o, i32_to_string(b));
export_obj_write_string(o, "/");
export_obj_write_string(o, i32_to_string(b));
export_obj_write_string(o, "/");
export_obj_write_string(o, i32_to_string(t + 1));
export_obj_write_string(o, " ");
export_obj_write_string(o, i32_to_string(b + 1));
export_obj_write_string(o, "/");
export_obj_write_string(o, i32_to_string(b + 1));
export_obj_write_string(o, "/");
export_obj_write_string(o, i32_to_string(t + 1));
export_obj_write_string(o, " ");
export_obj_write_string(o, i32_to_string(b + 2));
export_obj_write_string(o, "/");
export_obj_write_string(o, i32_to_string(b + 2));
export_obj_write_string(o, "/");
export_obj_write_string(o, i32_to_string(t + 1));
export_obj_write_string(o, "\n");
}
if (!ends_with(path, ".obj")) {
path = string("%s.obj", path);
}
iron_file_save_bytes(path, o, 0);
}