XY coords of the pixel the player is looking at

[SM Sith Lord]

I have a procedural texture placed on a prop and I want to get the X/Y coordinates of the pixel (in texture space) that the player is looking at. The attached diagram illustrates this.

I can see a lot of things that could potentially make this impossible, but lack the experience to know for sure without spending hours searching code & web.

Does anybody have suggestions on how I could accomplish this? Or alternatively, anybody know if this is impossible?

[Gary]

Can't use a VGUI? I assume that can do something similar since you can use them as touch screens.
https://developer.valvesoftware.com/wik ... n_Creation

[SM Sith Lord]

I'm not sure how to get the XY coordinates of the pixel the player is looking at even if its a VGUI surface rendered on the model.

[Sandern]

I'm not sure how to get the XY coordinates of the pixel the player is looking at even if its a VGUI surface rendered on the model.

What information are you lacking for calculating the XY coordinates? You should be able to calculate the XY coord as long as you know the 3d point the player is looking at (a simple trace forward or alternatively look at the code of C_VGuiScreen::ClientThink), the four coordinates of the corners of your screen and the resolution of your vgui render texture.

[SM Sith Lord]

Well, I'm not currently using a VGUI surface for the texture. Its a procedural texture that is skinned onto a prop.

However, I looked at the C_VGuiScreen::ClientThink function and it looks like it does exactly what I'm trying to do.

Where are these VGUI surfaces used in-game? It'd love to play around with one to see if it is behaving as I expect them to. My big concern is that they have to be drawn as flat planes as opposed to skinned onto props.

Thanks for the lead Sandern, I will be learning more about C_VGuiScreen class very soon.

[SM Sith Lord]

Basically the function will be given the player, a prop, and the name of a texture used on the prop that I want to find out where on it the player is looking.

The texture might span across multiple faces or might not be present on the prop at all.