RTX Mode and drawtext problem

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Lars Jacobsen asked Aug 31, '20 Phil BoBo answered Aug 31, '20

RTX Mode and drawtext problem

When I switch to RTX mode, text becomes hollow when I use drawtext on the OnDraw trigger. @phil.bobo

Software Version:

FlexSim 20.2.1

flexsim 20.2.1 rtx

1598849927173.png (51.2 KiB)

1598849970491.png (80.3 KiB)

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Lars Jacobsen commented · Aug 31, 2020 at 05:51 AM

Hi Joerg. I am just using standard FlexSim functionality, so I would expect it to work w/o having to do something special.

TextOnObject_2.fsm

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textonobject-2.fsm (24.8 KiB)

Joerg Vogel commented · Aug 31, 2020 at 05:20 AM

@lars_christian.j2, have you checked the surface normal vectors of the shape. Each surface has got two sides. If the normal vectors of the transparent surfaces are pointing inside the shape, this can cause such problem.

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Answer 1 · 2020-08-31T15:57:00Z

Phil BoBo answered Aug 31, '20

One of the current limitations of RTX Mode is that it only renders meshes drawn with GL_TRIANGLES. See https://docs.flexsim.com/en/20.2/Reference/GeneralModelSettings/ViewSettings/#more

It appears that the 3D text tesselator that converts from character glyph contours into 3D shapes may be returning meshes using triangle strips or triangle fans instead of just triangles.

I'll add a case to the dev list to improve this. In the meantime, if you want to draw 3D text in RTX Mode, you may need to make your 3D text in a 3D modeling application and import it as a custom 3D shape so that it is drawn with GL_TRIANGLES.

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