Gizmo Implementation

[xiaoxin0214]

I am trying to implement a translation editor, and the current visual effect looks like this:

default.mp4

To ensure that the coordinate axes are always rendered on top of other nodes, I've used vsg::Layer.

void TranslationEditor::createAxis()
{
    m_gizmo = vsg::MatrixTransform::create();
    m_gizmo->matrix = m_matrix;
    m_xAxis = createArrow(vsg::vec3{0, 0, 0}, vsg::vec3{1, 0, 0}, X_AXIS_COLOR);
    m_yAxis = createArrow(vsg::vec3{0, 0, 0}, vsg::vec3{0, 1, 0}, Y_AXIS_COLOR);
    m_zAxis = createArrow(vsg::vec3{0, 0, 0}, vsg::vec3{0, 0, 1}, Z_AXIS_COLOR);

    vsg::Builder builder;
    vsg::GeometryInfo geomInfo;
    vsg::StateInfo stateInfo;
    geomInfo.color = vsg::vec4{1, 1, 1, 1};
    geomInfo.transform = vsg::scale(0.1f, 0.1f, 0.1f);

    auto group = vsg::Group::create();
    uint32_t width = m_camera->viewportState->getViewport().width;
    uint32_t height = m_camera->viewportState->getViewport().height;
    VkClearValue clearValue{};
    clearValue.depthStencil = {0.0f, 0};
    VkClearAttachment attachment{VK_IMAGE_ASPECT_DEPTH_BIT, 1, clearValue};
    VkClearRect rect{VkRect2D{VkOffset2D{0, 0}, VkExtent2D{width, height}}, 0, 1};
    auto clearAttachments = vsg::ClearAttachments::create(vsg::ClearAttachments::Attachments{attachment}, vsg::ClearAttachments::Rects{rect});
    group->addChild(clearAttachments);
    auto sphere = builder.createSphere(geomInfo, stateInfo);
    group->addChild(sphere);
    group->addChild(m_xAxis);
    group->addChild(m_yAxis);
    group->addChild(m_zAxis);

    auto layer = vsg::Layer::create(999, 999, group);
    m_gizmo->addChild(layer);
    {
        auto result = m_viewer->compileManager->compile(m_gizmo);
        m_sceneGraph->addChild(m_gizmo);
        vsg::updateViewer(*m_viewer, result);
    }
}

How can I properly update the VkClearAttachment extent when the window is resized? Currently, the extent is set based on the initial window dimensions.

[robertosfield]

vsglayers exampl uses vsg::ClearAttachments to achieve the effect you are after:

vsglayers models/teapot.vsgt

[xiaoxin0214]

It seems there is no explicit logic implemented for handling window resize events. Is the VkClearAttachment extent automatically updated by VSG?

[robertosfield]

The vsg::WindowResizeHandler has a void WindowResizeHandler::apply(ClearAttachments& clearAttachments) implementation for resizing the clear attachments.