Jump to content
  • Advertisement

Archived

This topic is now archived and is closed to further replies.

OrenGL

How to align a texture with the screen in HLSL?

This topic is 5242 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Recommended Posts

I’m trying to understand how to align a texture with the screen in HLSL. I was trying to make a reflection effect in HLSL. I saw this done in Render Monkey and I tried to follow that example but there is one thing I don’t get. I flip the world through the mirror plane and render it to a texture. Then I want to apply the texture to the mirror. It doesn’t make sense to use the UV coordinates of the mirror. So I have to create UV coordinates for each vertex of the mirror passed to the Shader using only the vertex position. Of what I saw in the example it goes: float4 sPos = mul(view_proj_matrix, float4(Pos.xzy,1)); Out.Pos = sPos; Out.Tex.u = 0.5 * (sPos.z + sPos.x)/sPos.z; Out.Tex.v = 0.5 * (sPos.z - sPos.y)/sPos.z; I just can’t make out why the last two lines are correct. Any Ideas? Has some one done this maybe in a different way?

Share this post


Link to post
Share on other sites
Advertisement

  • Advertisement
×

Important Information

By using GameDev.net, you agree to our community Guidelines, Terms of Use, and Privacy Policy.

We are the game development community.

Whether you are an indie, hobbyist, AAA developer, or just trying to learn, GameDev.net is the place for you to learn, share, and connect with the games industry. Learn more About Us or sign up!

Sign me up!