Vendor node editor in-tree; add material presets; debug drag regression

Move the imgui-node-editor subset the build actually compiles from
third_party/imgui-node-editor to src/ui/NodeEditor (version-controlled,
MIT LICENSE included). FindImguiNodeEditor.cmake points at the new
location; CMakeLists excludes src/ui/NodeEditor from UI_SOURCES so it
isn't compiled twice.

Material editor presets: a Presets menu (disabled with no open material)
builds a UsdPreviewSurface + UsdUVTexture graph fed by an st primvar
reader, or a MaterialX standard_surface + image graph fed by a texcoord
node. Each is one idempotent, undoable command that re-normalizes layout.
Create Material becomes an icon button. New nodes route through
FindFreeCanvasSpot so a creation never lands on top of an existing node
(overlapping nodes fight over the editor hit test and become undraggable).

Shader-ball preview: pick a previewable output (terminal or 3/4-component
color-like) instead of always the first output, so scalar-only nodes keep
the whole-material preview rather than failing Storm codegen. Per-shape
camera frame-fit margins and auto-clip framing.

Fixes: DeletePrimCommand::Undo recreates missing destination ancestors
before SdfCopySpec (parent material may have been deleted after the
command ran). ConfigWindowsMoveFromTitleBarOnly stops a content-area drag
in the node canvas from moving the whole Material Editor window.

Temporary (marked for removal once the node-editor drag regression is
diagnosed): main.cpp mirrors LOG_INFO to %APPDATA%\UsdLayerManager\
debug.log; a g_AxNodeEditorDebugLog hook in the vendored editor plus a
[NodeGraph] event-trace block in RenderNodeGraphCanvas dump click/drag/
selection/position-save state.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

This commit is contained in:

indigo

2026-07-08 22:35:23 +08:00

parent 0f30e080e3

commit 038450a1ca

29 changed files with 13658 additions and 27 deletions

									
										src/ui/NodeEditor/BlueprintWidgets/Source/ax/Widgets.cpp
									
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				#include "ax/Widgets.h"

				#include "Interop.h"

				void ax::Widgets::Icon(const ImVec2& size, IconType type, bool filled, const ImVec4& color/* = ImVec4(1, 1, 1, 1)*/, const ImVec4& innerColor/* = ImVec4(0, 0, 0, 0)*/)

				{

				    if (ImGui::IsRectVisible(size))

				    {

				        auto cursorPos = ImGui::GetCursorScreenPos();

				        auto drawList  = ImGui::GetWindowDrawList();

				        ax::Drawing::DrawIcon(drawList, cursorPos, cursorPos + size, type, filled, ImColor(color), ImColor(innerColor));

				    }

				    ImGui::Dummy(size);

				}