Backside of face - Forum Open Cascade Technology

a-helcman
Wed, 05/01/2002 - 11:18

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Other usage issues

Hi All,

Is it possible to draw back side of the face in different color than the front side?

Greetings,
Adrian

Stephane Routelous
Wed, 05/01/2002 - 18:09

Hi,

to set the AIS_InteractiveObject derived object with a different color than the front side, do the following :

Handle_AIS_InteractiveObject theObj = ...
Handle_AIS_InteractiveContext theContext = ...
theObj->Attributes()->ShadingAspect()->Aspect()->SetDistinguishOn();
theObj->Attributes()->ShadingAspect()->Aspect()->SetFrontMaterial(Graphic3d_NOM_GOLD);
theObj->Attributes()->ShadingAspect()->Aspect()->SetBackMaterial(Graphic3d_NOM_JADE);
theContext->Redisplay(theObj);

It *should* work.

Attribute() returns a Handle_AIS_Drawer
ShadingAspect() returns a Handle_Prs3d_ShadingAspect
Aspect() returns a Handle_Graphic3d_AspectFillArea3d

So, see the file Graphic3d_AspectFillArea3d.cdl to see what is available.

HTH

Stephane
http://www.exotk.org

a-helcman
Thu, 05/02/2002 - 14:17

Stephane,

Thank you very much for information!

Best regards,
Adrian

a-helcman
Mon, 10/18/2004 - 11:12

hi,

it is possible to set a different material for front/back side of the face. but is it possible to set a different color for both sides?

i use the next lines to mix material + color:

po_AIS_Shape->Attributes()->ShadingAspect()->Aspect()->SetDistinguishOn();
po_AIS_Shape->Attributes()->ShadingAspect()->Aspect()->SetFrontMaterial(eFrontMaterial);
po_AIS_Shape->Attributes()->ShadingAspect()->Aspect()->SetBackMaterial(eBackMaterial);
po_AIS_Context->SetColor (po_AIS_Shape, eColor, false);

problem is, that SetColor function influences both sides here!

best regards,
adrian

Stephane Routelous
Mon, 10/18/2004 - 17:08

Hi Adrian,

I think you cannot mix materials and colors like that.
You have to set eColor to eFrontMaterial and/or to eBackMaterial.

Stephane

Jun WANG
Sat, 02/14/2009 - 10:08

Anybody knows how to handle this issue ?????????