Method updateSymmetryPrimitive

Source/RenderPasses/SDFEditor/SDFEditor.cpp:305–337

}

void SDFEditor::updateSymmetryPrimitive()
{
    const AnimationController* pAnimationController = mpScene->getAnimationController();
    const GeometryInstanceData& instance = mpScene->getGeometryInstance(mCurrentEdit.instanceID);
    float4x4 invInstanceTransform = transpose(pAnimationController->getInvTransposeGlobalMatrices()[instance.globalMatrixID]);

    const float3& instanceLocalPrimitivePos = mCurrentEdit.primitive.translation;
    float3 instanceLocalPlanePosition = transformPoint(invInstanceTransform, mUI2D.symmetryPlane.position);
    float3 instanceLocalPlaneNormal = normalize(transformVector(invInstanceTransform, mUI2D.symmetryPlane.normal));
    float3 projInstanceLocalPrimitivePos =
        (instanceLocalPrimitivePos - dot(instanceLocalPrimitivePos, instanceLocalPlaneNormal) * instanceLocalPlaneNormal);
    float3 projInstanceLocalPlanePos = dot(instanceLocalPlanePosition, instanceLocalPlaneNormal) * instanceLocalPlaneNormal;

    float3 reflectedInstanceLocalPos;
    if (length(projInstanceLocalPrimitivePos) > 0.0f)
    {
        reflectedInstanceLocalPos =
            math::reflect(-(instanceLocalPrimitivePos - projInstanceLocalPlanePos), normalize(projInstanceLocalPrimitivePos));
    }
    else
    {
        reflectedInstanceLocalPos = length(instanceLocalPrimitivePos - projInstanceLocalPlanePos) * -instanceLocalPlaneNormal;
    }

    reflectedInstanceLocalPos += projInstanceLocalPlanePos;

    float3x3 symmetricPrimitiveTransform = float3x3(inverse(mCurrentEdit.primitive.invRotationScale));
    symmetricPrimitiveTransform = math::rotate(float4x4(symmetricPrimitiveTransform), float(M_PI), instanceLocalPlaneNormal);

    mCurrentEdit.symmetryPrimitive = mCurrentEdit.primitive;
    mCurrentEdit.symmetryPrimitive.translation = reflectedInstanceLocalPos;
    mCurrentEdit.symmetryPrimitive.invRotationScale = inverse(float3x3(symmetricPrimitiveTransform));
}

void SDFEditor::setupPrimitiveAndOperation(
    const float2& center,