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Add Camera Guide viewport toggle (stageView.py DrawCameraGuides port)

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Adds a per-viewport "Camera Guide" toggle (default off) that draws a full
frustum wireframe box (near quad + far quad + 4 connecting edges) in oracle
orange for every non-active UsdGeomCamera prim, matching usdview's
displayCameraOracles behaviour. Uses GfFrustum::ComputeCorners() and the
same 24-index line layout as DrawCameraGuides. Toggle exposed in the
right-click context menu and gear popup; persists to INI as ShowCameraGuide.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
indigo
2026-06-30 02:35:39 +08:00
parent a59b3a5405
commit 6adf022c13
5 changed files with 57 additions and 0 deletions
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src/core/UsdSceneRenderer.cpp
+40
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@@ -166,6 +166,7 @@ void main() { outColor = color; }
UsdSceneRenderer::UsdSceneRenderer()
: m_showGrid(true)
, m_showCameraGuide(false)
, m_aaEnabled(false)
, m_backgroundColor(0.15f, 0.15f, 0.15f)
, m_shadingMode(ShadingMode::SmoothShaded)
@@ -1464,6 +1465,26 @@ void UsdSceneRenderer::BuildCameraWireframeLines(const pxr::GfCamera& gfCam,
push(arrowBase, arrowTip);
}
// Builds near quad + far quad + 4 connecting edges for the full GfFrustum.
// Mirrors stageView.py DrawCameraGuides: corners via GfFrustum::ComputeCorners(),
// line pairs via the same 24-index layout. Appends 24 XYZ float triples.
static void BuildCameraGuideLines(const pxr::GfCamera& gfCam,
std::vector<float>& outVerts)
{
const std::vector<pxr::GfVec3d> c = gfCam.GetFrustum().ComputeCorners();
// 0=LBN 1=RBN 2=LTN 3=RTN 4=LBF 5=RBF 6=LTF 7=RTF
static const int kIdx[24] = {
0,1, 1,3, 3,2, 2,0, // near quad
4,5, 5,7, 7,6, 6,4, // far quad
3,7, 0,4, 1,5, 2,6 // connecting edges
};
for (int i : kIdx) {
outVerts.push_back(static_cast<float>(c[i][0]));
outVerts.push_back(static_cast<float>(c[i][1]));
outVerts.push_back(static_cast<float>(c[i][2]));
}
}
// ===========================================================================
// DrawCameraWireframes
// ===========================================================================
@@ -1518,6 +1539,8 @@ void UsdSceneRenderer::DrawCameraWireframes(
pxr::GfMatrix4f vp = pxr::GfMatrix4f(viewProjMatrix);
std::vector<float> guideVerts; // accumulates frustum oracle lines
for (const auto& camPath : m_cachedCameraPaths) {
pxr::UsdPrim prim = stage->GetPrimAtPath(camPath);
if (!prim) continue;
@@ -1553,6 +1576,23 @@ void UsdSceneRenderer::DrawCameraWireframes(
glBindVertexArray(m_camWireVAO);
glDrawArrays(GL_LINES, 0, vertCount);
glBindVertexArray(0);
// Accumulate full-frustum oracle lines for non-active cameras (stageView.DrawCameraGuides)
if (m_showCameraGuide && !isActive)
BuildCameraGuideLines(gfCam, guideVerts);
}
// Draw all camera guide frustum boxes in one call (oracle orange from stageView.py)
if (m_showCameraGuide && !guideVerts.empty()) {
glUniform4f(m_bboxUniformColor, 0.82745f, 0.39608f, 0.16471f, 1.0f);
glBindBuffer(GL_ARRAY_BUFFER, m_camWireVBO);
glBufferData(GL_ARRAY_BUFFER,
static_cast<GLsizeiptr>(guideVerts.size() * sizeof(float)),
guideVerts.data(), GL_DYNAMIC_DRAW);
glUniformMatrix4fv(m_bboxUniformMVP, 1, GL_TRUE, vp.GetArray());
glBindVertexArray(m_camWireVAO);
glDrawArrays(GL_LINES, 0, static_cast<int>(guideVerts.size() / 3));
glBindVertexArray(0);
}
// Restore GL state