Hello.
Please help to understand. How did the author of the video do this? He projected a background image onto the plane so he created something like a shadow catcher, but i dont know how. Pls help me find out.
The author said:
“i use screen space to project a texture to the ground so it can catch the shadow. then merge it with the original video.
tips: in the shader u can use a sphere mask to make the ground edge translucent. so it will blend with the video very well.
about the reflection shader. i set the diffuse color pure black and add reflection with a little roughness.
in composure. just merge this reflection layer with background image with “add” or “screen” function.”
“in Composure. all the layer function is just a material. u can do whatever u like in the material.
u can RMB in the material. in “Composure” label. u can find some material function that UE4 have been done for u.(something like “over” “premult” “in”)
. u can use this simple function or do it by yourself.
for example like “add” mode. just add the RGB together of two layers then connect the result to the “Emissive Color”. the alpha is very important. for me i just use the Background’s Alpha.
the screen space is just the viewportUV. use this uv to instead of the poly’s uv to project the texture.
u can find this node in Material. (if i remember correctly i called “ScreenPosition”)”
