Hi ,

I am trying to fill a custom shape which is defined by points that define its edges/vertices points.

The points are in clockwise order.

Image below will show the exactly what I mean by custom shape. Shapes are drawn and filled in red.

[attachment=32004:regions.PNG]

I have tried to use a triangle strip when drawing and filling it with a color but doesn't draw as expected.

Any suggestions how could they be achieved ?

I meant the entire shape is not filled and but rather weird triangles are drawn at the edges.

I've included images below to explain things a bit more as to how my shapes are being rendered (shown in green color)

Using Linestrip:

[attachment=32007:LineStrip.PNG]

Using TriangleStrip:

[attachment=32008:TriangleStrip.PNG]

Thanks.

Thanks for the reply Adam,

Is there any other way to fill an arbitrary shaped polygon other than using triangulation.

I have used LineStrip, LineStripWithAdjacency, TriangleStrip, TriangleStripWithAdjacencybut had no luck so far.

However, i will go as per your suggestion below:

Try searching online for "Polygon Triangulation", there are algorithms for doing it efficiently, but I suspect the answer isn't as simple as you're expecting.

However, if you have any other suggestions too then do let me know.

Thanks.

Thanks for the reply @Adam.

I will have a read through after researching and understanding things a bit more on Polygon Triangulation and then post back once i understand or have question.

Thanks.

Thanks @Amr for your reply.

I haven't really had any exposure to stencil via Directx as i'm still a newbie hence would need to read on them before i can decide if they would be helpful in achieving my goal.

However, i'm wondering how to really draw the shape such as the signature letter "G " you've drawn. How could that be achieved which is really the problem im facing at the moment ?

Any suggestion on good resources to read from ?

Note:

I'm using C# with SharpDx with Directx11

Thanks.

@Amr

Ok i have looked a bit into stencil buffer but due to lcak of time i have shelved it for now but will read + learn more in due time.

So far using the native way of rendering polygon using triangles i have managed to get things further, or shall i say i'm almost there.

Now my polygon shape isn't rendered completely when compared to image shown in my original post at the top and i can't seem to figure it out. why...

So far what iv achieved is in image below:

[attachment=32016:Improved_shapeRender.PNG]

Points used to render:

[attachment=32017:Render_Points_values.PNG]

From the image above it seems some points are not being rendered.

AS to what i'm doing:

• Setting the primitive topology to be TriangleStrip
• Calling draw with no of points => draw(pointscount)

If i render the points using a pointlist they all render correctly as expected

But can't seem to figure out as what i'm doing wrong if i try to render they as triangle strip.

Any suggestions ?