Stencil works with polygons but images

[rebel1324]

Do anyone have any idea why this is happening?

image is something like this
https://i.imgur.com/p5YPlIR.png
but when I use stencil, I get rectangle area.

this is part of example code.
draw circle is replaced to draw circle texture.

    render.ClearStencil()
    render.SetStencilEnable(true)
        render.SetStencilWriteMask(255)
        render.SetStencilTestMask(255)
        render.SetStencilReferenceValue(1)
        render.SetStencilFailOperation(STENCILOPERATION_KEEP)
        render.SetStencilZFailOperation(STENCILOPERATION_KEEP)
        render.SetStencilPassOperation(STENCILOPERATION_REPLACE)
        render.SetStencilCompareFunction(STENCILCOMPARISONFUNCTION_ALWAYS)
        render.SetBlend(0) --don't visually draw, just stencil

        surface.SetDrawColor( 0, 0, 0, 1 )
        local r = radius * 2
        surface.DrawRect(x - radius, y + radius - r*frac, r,r*frac)

        render.SetBlend(1)
        render.SetStencilCompareFunction(STENCILCOMPARISONFUNCTION_EQUAL)
        surface.SetDrawColor(col)
        drawCircle(x,y, radius)
    render.SetStencilEnable(false)

[bitches]

The rendering area is all the stencil cares about. That's going to be the full rectangle irrespective of which parts in it are transparent. You'll have to draw a circle out of lua polygons instead.

[rebel1324]

damn that's sucks ass

[Gmod4phun]

Try looking up Blue's masks and shadows on Facepunch, at least that is what I think it was called, I believe it might be useful for your problem.

[Nak]

I believe the function you're looking for is: render.OverrideBlend(...).
It allows you to override the graphical function for color and alpha. Even allow you to subtract a texture by its alpha.

[rebel1324]

let me try mate