Writing Unity Shaders Using Depth Textures

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Writing Unity Shaders Using Depth Textures
Udemy Course: https://www.udemy.com/course/unity-sh...

Today I'll be doing this effect that uses the depth texture to create this inverse world like effect

This is the math and code to create the rotational effect

float2 textureCoordinate = i.screenPosition.xy / i.screenPosition.w;
float r = dot(i.viewDir, normalize(i.normal)) * 2 + _Time.y;
float g = (atan2(i.normal.y, i.normal.x) / 2 * UNITY_PI ) + 0.5 + _Time.y;
fixed4 col = tex2D(_MainTex, float2(r,g));
float depth = Linear01Depth(SAMPLE_DEPTH_TEXTURE(_CameraDepthTexture, textureCoordinate));
float3 color = lerp(_ColorOne, _ColorTwo, depth);
float fresnel = pow(dot(i.viewDir, normalize(i.normal) ),0.3);
return fixed4(pow(color * fresnel,2)*2 + col * (1-fresnel) * 2,1);

Ben here, and I've been writing shaders and full systems of shaders in Unity from scratch for 6-7 years now. Shaders, especially HLSL or CG shaders seem to be less known in Unity, so I just wanted to do my part, share my experiences and really show others how to write shader code.

The goal is to teach others how to write optimal shader code that is production-ready. I also want to try to recreate the cool-looking effects we see in other games. It would be awesome to see more and more people write shaders from scratch, understand it at a deeper level and ultimately create their own shaders.

Content of this video
0:00 - Intro & Setup
1:37 - Screen Space UVs
3:41 - Depth texture
5:40 - Decode it
8:00 - Color it
9:10 - Fresnel

#unity3d #unitydeveloper #gamedev #shaders

For more in-depth access I do have a Udemy course that I will continue to update as I create more mini-lessons.

https://www.udemy.com/course/unity-sh...