Alembic export: evaluation mode option

This option will determine visibility on either render or the viewport
visibility. Same for modifer settings. So it will either evaluate the
depsgrah with DAG_EVAL_RENDER or DAG_EVAL_VIEWPORT.
This not only makes it more flexible, it is also a lot
clearer which visibility / modfier setting is taken into account (up
until now, this was always considered to be DAG_EVAL_RENDER)

This option was always present in the USD exporter, this just brings
Alembic in line with that.

ref. T89594

Maniphest Tasks: T89594

Differential Revision: https://developer.blender.org/D11820

source/blender/editors/io/io_alembic.c

@@ -63,10 +63,26 @@
 #  include "WM_api.h"
 #  include "WM_types.h"
 
+#  include "DEG_depsgraph.h"
+
 #  include "io_alembic.h"
 
 #  include "ABC_alembic.h"
 
+const EnumPropertyItem rna_enum_abc_export_evaluation_mode_items[] = {
+    {DAG_EVAL_RENDER,
+     "RENDER",
+     0,
+     "Render",
+     "Use Render settings for object visibility, modifier settings, etc"},
+    {DAG_EVAL_VIEWPORT,
+     "VIEWPORT",
+     0,
+     "Viewport",
+     "Use Viewport settings for object visibility, modifier settings, etc"},
+    {0, NULL, 0, NULL, NULL},
+};
+
 static int wm_alembic_export_invoke(bContext *C, wmOperator *op, const wmEvent *event)
 {
   if (!RNA_struct_property_is_set(op->ptr, "as_background_job")) {
@@ -136,6 +152,7 @@ static int wm_alembic_export_exec(bContext *C, wmOperator *op)
       .triangulate = RNA_boolean_get(op->ptr, "triangulate"),
       .quad_method = RNA_enum_get(op->ptr, "quad_method"),
       .ngon_method = RNA_enum_get(op->ptr, "ngon_method"),
+      .evaluation_mode = RNA_enum_get(op->ptr, "evaluation_mode"),
 
       .global_scale = RNA_float_get(op->ptr, "global_scale"),
   };
@@ -195,6 +212,9 @@ static void ui_alembic_export_settings(uiLayout *layout, PointerRNA *imfptr)
   uiItemR(sub, imfptr, "selected", 0, IFACE_("Selected Objects"), ICON_NONE);
   uiItemR(sub, imfptr, "visible_objects_only", 0, IFACE_("Visible Objects"), ICON_NONE);
 
+  col = uiLayoutColumn(box, true);
+  uiItemR(col, imfptr, "evaluation_mode", 0, NULL, ICON_NONE);
+
   /* Object Data */
   box = uiLayoutBox(layout);
   row = uiLayoutRow(box, false);
@@ -460,6 +480,14 @@ void WM_OT_alembic_export(wmOperatorType *ot)
       "This option is deprecated; EXECUTE this operator to run in the foreground, and INVOKE it "
       "to run as a background job");
 
+  RNA_def_enum(ot->srna,
+               "evaluation_mode",
+               rna_enum_abc_export_evaluation_mode_items,
+               DAG_EVAL_RENDER,
+               "Use Settings for",
+               "Determines visibility of objects, modifier settings, and other areas where there "
+               "are different settings for viewport and rendering");
+
   /* This dummy prop is used to check whether we need to init the start and
    * end frame values to that of the scene's, otherwise they are reset at
    * every change, draw update. */

source/blender/io/alembic/ABC_alembic.h

@@ -19,6 +19,8 @@
  * \ingroup balembic
  */
 
+#include "DEG_depsgraph.h"
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -62,6 +64,7 @@ struct AlembicExportParams {
   bool export_particles;
   bool export_custom_properties;
   bool use_instancing;
+  enum eEvaluationMode evaluation_mode;
 
   /* See MOD_TRIANGULATE_NGON_xxx and MOD_TRIANGULATE_QUAD_xxx
    * in DNA_modifier_types.h */

source/blender/io/alembic/exporter/abc_export_capi.cc

@@ -213,8 +213,7 @@ bool ABC_export(Scene *scene,
   job->export_ok = false;
   BLI_strncpy(job->filename, filepath, sizeof(job->filename));
 
-  job->depsgraph = DEG_graph_new(
-      job->bmain, scene, view_layer, DAG_EVAL_RENDER /* TODO(Sybren): params->evaluation_mode */);
+  job->depsgraph = DEG_graph_new(job->bmain, scene, view_layer, params->evaluation_mode);
   job->params = *params;
 
   bool export_ok = false;

source/blender/io/alembic/exporter/abc_writer_abstract.cc

@@ -137,7 +137,7 @@ void ABCAbstractWriter::update_bounding_box(Object *object)
 
 void ABCAbstractWriter::write_visibility(const HierarchyContext &context)
 {
-  const bool is_visible = context.is_object_visible(DAG_EVAL_RENDER);
+  const bool is_visible = context.is_object_visible(args_.export_params->evaluation_mode);
   Alembic::Abc::OObject abc_object = get_alembic_object();
 
   if (!abc_visibility_.valid()) {

source/blender/io/alembic/exporter/abc_writer_mesh.cc

@@ -162,7 +162,7 @@ ModifierData *ABCGenericMeshWriter::get_liquid_sim_modifier(Scene *scene, Object
 bool ABCGenericMeshWriter::is_supported(const HierarchyContext *context) const
 {
   if (args_.export_params->visible_objects_only) {
-    return context->is_object_visible(DAG_EVAL_RENDER);
+    return context->is_object_visible(args_.export_params->evaluation_mode);
   }
   return true;
 }