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camera: UE Scene-view semantics — RMB fly, MMB focus-orbit, wheel dolly, F focus

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Key conflict fix (UE semantics): while RMB is held the keyboard belongs
to the camera, so WASD no longer collides with the gizmo W/E/R tool
hotkeys. Editor mode gates fly movement behind RMB; game mode keeps
always-on WASD. Viewport tool hotkeys (W/E/R/T/F) are suppressed while
RMB is held.

Focus orbit (pivot): MMB drag rotates the camera around a pivot keeping
distance; first orbit picks a pivot 5m ahead on the view ray. Shift+MMB
pans in screen plane (camera and pivot move together). Mouse wheel
dollies toward/away from the pivot with exponential steps (no pivot:
move along view ray). F focuses the selected entity (frame-selection):
pivot set to its position, camera slides along the view ray; orbit
distance persists.

Window gains a polled scroll-delta channel (ConsumeScrollDelta) that
respects ImGui mouse capture; Camera::Update mutates orbit state (no
longer const).
This commit is contained in:
atdunbg
2026-10-03 13:02:55 +08:00
parent 9ff08651f0
commit ffe33e9967
6 changed files with 178 additions and 45 deletions
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App/editor/ViewportPanel.cpp
+27 -15
View File
@@ -125,26 +125,38 @@ std::optional<entt::entity> ViewportPanel::Draw(const EditorContext &ctx,
else size.y = avail.x / aspect;
ImGui::Image((ImTextureID) (intptr_t) sceneTex, size);
// ---- W/E/R 切换 Gizmo 模式（UE 语义：W 平移 / E 旋转 /
// R 缩放），T 切换 local/world 操纵空间。仅 Viewport 持焦时
// 生效——输入框打字（WantTextInput）由 BlockingKeyboard 拦
// 游戏侧，但 ImGui 自身仍收键，故必须限定持焦面板，避免在
// Inspector 拖数值时误切 ----
if (out.focused && !ImGui::GetIO().WantTextInput) {
if (ImGui::IsKeyPressed(ImGuiKey_W)) gizmo.op = ImGuizmo::TRANSLATE;
if (ImGui::IsKeyPressed(ImGuiKey_E)) gizmo.op = ImGuizmo::ROTATE;
if (ImGui::IsKeyPressed(ImGuiKey_R)) gizmo.op = ImGuizmo::SCALE;
if (ImGui::IsKeyPressed(ImGuiKey_T)) gizmo.localSpace = !gizmo.localSpace;
}
// ---- Gizmo 操纵杆（ImGui drawlist 叠加，无 GPU pass）----
// 选中实体 + 有 Transform 才出杆；矩阵分解直接写回
// TransformComponent（与 Inspector 同源，下一帧数值自动跟随）
// ---- 工具热键（UE 语义）：W/E/R 切 Gizmo 模式、T 切
// local/world、F 焦点选中实体。仅 Viewport 持焦时生效——
// 输入框打字（WantTextInput）由 BlockingKeyboard 拦游戏侧，
// 但 ImGui 自身仍收键，故必须限定持焦面板。RMB 按住 = 相机
// 飞行模式（键盘归相机），工具热键全部抑制——W 前进与
// W 平移 Gizmo 的键位冲突就此解耦 ----
auto &reg = ctx.scene->GetRegistry();
ECS::TransformComponent *tr =
selected != entt::null
? reg.try_get<ECS::TransformComponent>(selected)
: nullptr;
if (out.focused && !ImGui::GetIO().WantTextInput &&
!ImGui::IsMouseDown(ImGuiMouseButton_Right)) {
if (ImGui::IsKeyPressed(ImGuiKey_W)) gizmo.op = ImGuizmo::TRANSLATE;
if (ImGui::IsKeyPressed(ImGuiKey_E)) gizmo.op = ImGuizmo::ROTATE;
if (ImGui::IsKeyPressed(ImGuiKey_R)) gizmo.op = ImGuizmo::SCALE;
if (ImGui::IsKeyPressed(ImGuiKey_T)) gizmo.localSpace = !gizmo.localSpace;
if (ImGui::IsKeyPressed(ImGuiKey_F) && tr != nullptr) {
// F = 焦点选中实体（frame-selection）：环绕 pivot 设
// 为选中实体位置，相机沿视线平移对准（环绕距离沿用
// 当前值，滚轮可调）
ECS::TransformComponent *camT = nullptr;
if (auto *camComp = ctx.scene->GetPrimaryCamera(&camT);
camComp != nullptr && camT != nullptr) {
camComp->camera.FocusOn(*camT, tr->GetPosition());
}
}
}
// ---- Gizmo 操纵杆（ImGui drawlist 叠加，无 GPU pass）----
// 选中实体 + 有 Transform 才出杆；矩阵分解直接写回
// TransformComponent（与 Inspector 同源，下一帧数值自动跟随）
if (tr != nullptr) {
// 相机矩阵：primary 相机 view + Vulkan proj（转 GL 形式），
// 参数与渲染侧一致（aspect = 渲染分辨率、near/far 0.1/100）