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Refactor pad thickness calculations to use actual copper thickness instead of a fixed value. This change improves accuracy in FEM simulations and margin adjustments for pads.

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This commit is contained in:
“Alihossein 2025-06-10 10:07:58 -06:00
parent 63fadcbcce
commit b1866776af
1 changed files with 18 additions and 7 deletions
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25
pcbnew/exporters/step/step_pcb_model.cpp
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@ -795,7 +795,6 @@ STEP_PCB_MODEL::~STEP_PCB_MODEL()
bool STEP_PCB_MODEL::AddPadShape( const PAD* aPad, const VECTOR2D& aOrigin, bool aVia,
SHAPE_POLY_SET* aClipPolygon )
{
const double c_padExtraThickness = 0.005;
bool success = true;
std::vector<TopoDS_Shape> padShapes;
bool castellated = aClipPolygon && aPad->GetProperty() == PAD_PROP::CASTELLATED;
@ -814,13 +813,15 @@ bool STEP_PCB_MODEL::AddPadShape( const PAD* aPad, const VECTOR2D& aOrigin, bool
double Zpos, thickness;
getLayerZPlacement( pcb_layer, Zpos, thickness );
double copperExtraThickness = std::abs( thickness ); // Use actual copper thickness
if( !aVia )
{
// Pad surface as a separate face for FEM simulations.
if( pcb_layer == F_Cu )
thickness += c_padExtraThickness;
thickness += copperExtraThickness;
else if( pcb_layer == B_Cu )
thickness -= c_padExtraThickness;
thickness -= copperExtraThickness;
}
TopoDS_Shape testShape;
@ -882,8 +883,10 @@ bool STEP_PCB_MODEL::AddPadShape( const PAD* aPad, const VECTOR2D& aOrigin, bool
if( !aVia )
{
// Pad surface is slightly thicker
f_thickness += c_padExtraThickness;
b_thickness -= c_padExtraThickness;
double f_copperExtraThickness = std::abs( f_thickness );
double b_copperExtraThickness = std::abs( b_thickness );
f_thickness += f_copperExtraThickness;
b_thickness -= b_copperExtraThickness;
}
double top = std::max( f_pos, f_pos + f_thickness );
@ -974,9 +977,17 @@ bool STEP_PCB_MODEL::AddHole( const SHAPE_SEGMENT& aShape, int aPlatingThickness
// is bigger than the board with copper
// must be > OCC_MAX_DISTANCE_TO_MERGE_POINTS
// Pads are taller by 0.01 mm
// Pads are taller by the actual copper thickness on both top and bottom
if( !aVia )
margin += 0.01;
{
double f_pos, f_thickness;
double b_pos, b_thickness;
getLayerZPlacement( F_Cu, f_pos, f_thickness );
getLayerZPlacement( B_Cu, b_pos, b_thickness );
double f_copperExtraThickness = std::abs( f_thickness );
double b_copperExtraThickness = std::abs( b_thickness );
margin += f_copperExtraThickness + b_copperExtraThickness;
}
double f_pos, f_thickness;
double b_pos, b_thickness;