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feat(editor): river/path carver tool for terrain channels

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- River Carver in Sculpt panel: carves a channel between two points
  with configurable width and depth
- Set Start at cursor, then Set End + Carve to create the channel
- Smooth quadratic falloff at edges for natural riverbank shape
- Works by projecting each terrain vertex onto the line segment and
  lowering height based on distance from center
- Auto-stitches chunk edges after carving
- Pair with Water mode to fill the carved channel with liquid
This commit is contained in:
Kelsi 2026-05-05 06:30:26 -07:00
parent 14bb2cf7de
commit d573f3a678
3 changed files with 68 additions and 0 deletions
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25
tools/editor/editor_ui.cpp
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@ -459,6 +459,31 @@ void EditorUI::renderBrushPanel(EditorApp& app) {
}
ImGui::Separator();
if (ImGui::CollapsingHeader("River / Path Carver")) {
static glm::vec3 riverStart{0}, riverEnd{0};
static float riverWidth = 8.0f, riverDepth = 5.0f;
static bool riverStartSet = false;
ImGui::SliderFloat("Width##river", &riverWidth, 2.0f, 50.0f);
ImGui::SliderFloat("Depth##river", &riverDepth, 1.0f, 30.0f);
auto& brush4 = app.getTerrainEditor().brush();
if (ImGui::Button("Set Start##river", ImVec2(120, 0)) && brush4.isActive()) {
riverStart = brush4.getPosition();
riverStartSet = true;
app.showToast("River start set");
}
ImGui::SameLine();
if (ImGui::Button("Set End + Carve##river", ImVec2(140, 0)) && brush4.isActive() && riverStartSet) {
riverEnd = brush4.getPosition();
app.getTerrainEditor().carveRiver(riverStart, riverEnd, riverWidth, riverDepth);
app.showToast("River carved");
riverStartSet = false;
}
if (riverStartSet)
ImGui::TextColored(ImVec4(0.5f, 0.9f, 0.5f, 1), "Start set — click end point");
else
ImGui::TextColored(ImVec4(0.6f, 0.6f, 0.6f, 1), "Set start then end to carve");
}
if (ImGui::CollapsingHeader("Mirror Terrain")) {
if (ImGui::Button("Mirror X (Left<>Right)", ImVec2(-1, 0))) {
app.getTerrainEditor().mirrorX();