Drawing image with SlimDX in game world

[-Ryuk-]

Hey all,

Im wondering how to draw an image in game like Sonar by YetiBots does... For these that don't know what I mean



I can draw lines and boxes using DrawUserPrimitives, but I am not sure how I would go about the image. I know SlimDX has a Texture & Sprite Object... Has anyone tried this with SlimDX and can point me in the right direction?


Thanks

[Master674]

It's actually very simple. All you do is create a plane thats orthogonal to the cameras forward vector and set up a small rectangle for the texture there.
Extract Right, Up and Forward vectors from the view matrix and use them to set up a billboarded quad to which you apply the texture.

[-Ryuk-]

It's actually very simple. All you do is create a plane thats orthogonal to the cameras forward vector and set up a small rectangle for the texture there.
Extract Right, Up and Forward vectors from the view matrix and use them to set up a billboarded quad to which you apply the texture.

Okay I will see if I can figure that out.

On another note:
Some time ago in another drawing thread we spoke about Zbuffer with rendering, did you ever sort this without hooking the other function? (I don't remember the name)

[Master674]

Okay I will see if I can figure that out.

On another note:
Some time ago in another drawing thread we spoke about Zbuffer with rendering, did you ever sort this without hooking the other function? (I don't remember the name)

I don't remember what I did in WoW but for Wildstar and other games I just grab the games DepthStencilView by hooking ID3D11DeviceContext::OMSetRenderTargets and set it again when drawing my stuff.

[namreeb]

Ryuk, if you get this working I hope you will share some of your experiences here. This is something I've always wanted to try but never got around to doing.

[Wildbreath]

ui z-layer first and it value 0.6 as i remember

        public static void SetupViewport() 
        { 
            D3DViewport viewport = Device.GetViewport(); 
            viewport.MinZ = 0; 
            viewport.MaxZ = 0.94f; 
            Device.SetViewport(viewport); 
        } 
 
        public static unsafe void SetupView() 
        { 
            Matrix matrix = Matrix.LookAtRH(Camera.Position, Camera.Position + Camera.Forward(), Vector3.Up); 
            Device.SetTransform(D3DTransformStateType.VIEW, &matrix); 
        } 
 
        public static unsafe void SetupProjection() 
        { 
            Matrix matrix = Matrix.PerspectiveFovRH(Camera.GetFov() * .6f, 1.777f, Camera.NearZ, Camera.FarZ); 
            Device.SetTransform(D3DTransformStateType.PROJECTION, &matrix); 
        }  

and

            Device.SetRenderState(D3DRenderStateType.ZENABLE, 1u); 
            Device.SetRenderState(D3DRenderStateType.ZWRITEENABLE, 1u); 
            Device.SetRenderState(D3DRenderStateType.ZFUNC, (int)D3DCmp.LESSEQUAL);  

[-Ryuk-]

ui z-layer first and it value 0.6 as i remember

        public static void SetupViewport()
        {
            D3DViewport viewport = Device.GetViewport();
            viewport.MinZ = 0;
            viewport.MaxZ = 0.94f;
            Device.SetViewport(viewport);
        }

        public static unsafe void SetupView()
        {
            Matrix matrix = Matrix.LookAtRH(Camera.Position, Camera.Position + Camera.Forward(), Vector3.Up);
            Device.SetTransform(D3DTransformStateType.VIEW, &matrix);
        }

        public static unsafe void SetupProjection()
        {
            Matrix matrix = Matrix.PerspectiveFovRH(Camera.GetFov() * .6f, 1.777f, Camera.NearZ, Camera.FarZ);
            Device.SetTransform(D3DTransformStateType.PROJECTION, &matrix);
        }  

and

            Device.SetRenderState(D3DRenderStateType.ZENABLE, 1u);
            Device.SetRenderState(D3DRenderStateType.ZWRITEENABLE, 1u);
            Device.SetRenderState(D3DRenderStateType.ZFUNC, (int)D3DCmp.LESSEQUAL);  

Both camera.NearZ & Far.Z are both 0 for me! I can draw above everything with setting a hard coded value of 1 for NearZ

Ryuk, if you get this working I hope you will share some of your experiences here. This is something I've always wanted to try but never got around to doing.

I will do

[Master674]

WoW had a function called World::GetNearClip/World::GetFarClip. You will need correct clipping values if you want to draw with z-testing.
I don't know if WoW does the same but WildStar sets the DepthStencilView to nullptr before it calls Present so you might have to grab the depth buffer by hooking OMSetRenderTargets or SetDepthStencilSurface for DX9.

[-Ryuk-]

Ryuk, if you get this working I hope you will share some of your experiences here. This is something I've always wanted to try but never got around to doing.

WoW had a function called World::GetNearClip/World::GetFarClip. You will need correct clipping values if you want to draw with z-testing.
I don't know if WoW does the same but WildStar sets the DepthStencilView to nullptr before it calls Present so you might have to grab the depth buffer by hooking OMSetRenderTargets or SetDepthStencilSurface for DX9.

Yep, I was talking to someone on skype yesterday and remembered that. The problem is finding those functions again!