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Offer the Sliced Objects as a Solid Model While Dragging

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The G-code preview draws every toolpath segment as an instanced box, and its frame cost is
linear in the number of segments drawn. On a plate of large objects that is enough that
dragging the camera or a preview slider cannot keep up, and no amount of per-segment work
changes that; only drawing fewer segments does.

The objects themselves are cheaper: a mesh costs its triangles once, however many layers it
has, and the preview already loads the objects as shells for its translucent ghost. A new
preference, "Only render solid model when dragging" (off by default), draws those shells
opaque in their filament colours instead of the toolpaths while the user drags.

The visible layer range still holds. The shells are cut at the range's top and bottom through
the gouraud shader's z range, and libvgcode keeps a second index buffer holding just the
range's bottom and top layers, filled in the same walk as the full one, which is drawn
afterwards so that it caps the cut with what was really printed there. Switching between the
two sets is a buffer binding, never a rebuild. The prime tower is added to the shells from its
sliced mesh while the preference is on, positioned as the print placed it; it keeps its opaque
colour and so stays out of the translucent ghost. Supports have no mesh and are not shown.

Dragging is the camera, the navigator or either slider being held; a slider reports it from
ImGui's active id, since its dirty flag is raised and consumed inside one frame. A wheel step
holds the solid model for a 150 ms settle time, with the frame that restores the toolpaths
scheduled for when it runs out. The switch is decided at the top of the frame, before the
cached scene is consulted, and a frame that switches redraws the scene. A drag cut short by
focus or capture loss is ended explicitly, and a button release wakes the idle loop, since on
some platforms no idle event follows it until the next input.

With the preference off, nothing is built and the preview is unchanged.
This commit is contained in:
Hanif Koh
2026-09-23 02:22:43 +08:00
parent c9c69c7249
commit ca1162c5df
14 changed files with 440 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/slic3r/GUI/IMSlider.cpp
+7
View File
@@ -483,6 +483,11 @@ void IMSlider::draw_background_and_groove(const ImRect& bg_rect, const ImRect& g
ImGui::RenderFrame(groove.Min, groove.Max, groove_col, false, 0.5 * groove.GetWidth());
}
bool IMSlider::is_dragging() const
{
return GImGui != nullptr && m_imgui_id != 0 && GImGui->ActiveId == m_imgui_id && GImGui->IO.MouseDown[0];
}
bool IMSlider::horizontal_slider(const char* str_id, int* value, int v_min, int v_max, const ImVec2& size, float scale)
{
ImGuiWindow* window = ImGui::GetCurrentWindow();
@@ -491,6 +496,7 @@ bool IMSlider::horizontal_slider(const char* str_id, int* value, int v_min, int
ImGuiContext& context = *GImGui;
const ImGuiID id = window->GetID(str_id);
m_imgui_id = id;
const ImVec2 pos = window->DC.CursorPos;
const ImRect draw_region(pos, pos + size);
@@ -883,6 +889,7 @@ bool IMSlider::vertical_slider(const char* str_id, int* higher_value, int* lower
ImGuiContext& context = *GImGui;
const ImGuiID id = window->GetID(str_id);
m_imgui_id = id;
const ImVec2 pos = window->DC.CursorPos;
const ImRect draw_region(pos, pos + size);