MatCap Materials - Shader Graph Basics - Episode 31

[@stevphiericardo2790]

You sir, deserves millions subscribers... thanks so much for transfering your shader knowledge to us.. and thanks for the hard work!

[@PatinaGames]

At 8:12 the split and append, if you go inside them the split is just a bunch of mask components and the append is chained append vectors, kinda the same but you can just mask R and mask G from the same reroute pin and them append them to each other in the opposite order. The compiler is probably doing this under the hood but it might eliminate a few instructions. Thanks for the vid!

[@BenCloward]

Any operations that just move components around (mask, append, split, swizzle, etc) are always free. Math instructions aren't required to do that. So the method used pretty much comes down to how you want to organize things in the graph.

[@larrychin1220]

Thanks, i recreated this in UPR shader code and works just fine, but would be nice if you could provide some insights of why this works, im not asking for a another video just for explaining the math details but some keywords or a direction of extra reading materials could help a lot.

[@geodraws]

Hey Ben! I was the one that asked about this in the previous video and you made a follow up video! Thank you so much! I want to ask more about the reasoning behind doing a cross product with the vertex position in view space, what's the reason behind that?

[@欧阳徉]

metoo, and i don't know why i need exchange R and G channel

[@jakubpulka]

I remember time when Quest 1 was not yet released nor even announced and company where I worked received dev kit. I wish I knew this trick that time, because we had a lot of issues with performance caused by ice reflections... and without it all looked dull. Your channel is amazing :) Big thanks!

[@goldennboy1989]

Would be nice to see the results on a non-spherical mesh :)

[@YASIR.K]

Thanks, Ben.

[@lianghanli835]

Hi Ben, Thanks for your tuorials. Could you please explain a bit more about why the 'Cross Product' you used here could solve this issue?

[@magicamecil]

Thank you for the help!!

[@theman7050]

Absolute legend!!

[@aslack6145]

yaaaaaaaaaay absolutely gold

[@geri4367]

Phenomenal, thanks for the update :D

[@JenAnty_JA]

Well done and you're right - it's quite cheap.

[@antoniosuarez7881]

thanks, grate tutorial

[@noisegrindercn]

Cross product the CameraVector and VertexNormal in world space then convert the result to view space could save some instructions.

[@ussdev1988]

Hey Ben, thanks for your videos helping alot refreshing knowledge :) in this video u have a little node missed. in shader graph u have before the sample texture to add a rotate node set to 180 degrees otherwise are the textures flipped :)

[@RoniStudio]

Nice Video Sir 👍

[@wellweldedgames]

But how can we make this mat cap shader take a normal map in count? Do we need a dot product between an absolute world position input and our normal map?

[@BenCloward]

To use a normal map, instead of using the Normal Vector (Unity) or VertexNormalWS (Unreal) use the normal from the normal map instead and transform it from Tangent Space to View space. Then use that as the second input to the Cross Product node.

[@windbt6113]

Hey Ben, I just try to calculate the coordinate of the view space. In my calculation, the Z axis is target to the object, the X axis is perpendicular to the Z axis to point right, the Y axis is point down, am I right?

[@Devorkan]

Why does that work though? I don't understand what the flipped vector from the cross product represents

[@GARIKDoroshchuk]

Hi Ben, thx for tutorial. I've a question: Why don't you use Remap node in Unity when you're doing multiply and add operations?

[@BenCloward]

The remap node is a much more broadly applicable node and, as such, it performs more operations in order to achieve its results. That means it's slightly more expensive than just doing a multiply and an add.

[@MarkOfArgyll]

I'm guessing Unreals swizzle node doesn't do what you need in this case?

[@S-I-T]

Could I have a flip book of matcaps? Would be a great way of faking a dynamically changing material like a molten metal glow.

[@BenCloward]

Oooh, yes you could. That's a cool idea!

[@S-I-T]

Would be a great way of shading a mesh explosion from hot to cool smoke. Great tutorials. Quality teaching thank you.

[@Sukorru]

Is there a reason the unreal graph did not multiply the green channel by -1?

[@BenCloward]

UV coordinates are treated differently between the two engines. One has the UV origin in the lower left and the other has it in the upper left. So the flip is required to make the results consistent between the two.

[@snark567]

For some reason the matcap doesn't display properly, it's devided into 4 images when viewed on the sphere.

[@BenCloward]

I can think of a couple of things that might cause that: 1. The math in the shader is wrong. Double check that what you're doing is the same as what I showed. 2. The MatCap texture is saved in a different configuration. There are lots of different ways of doing MatCap. The texture needs to match the method used in the shader. The shader I'm showing here requires that the MatCap image just be a single sphere, but other software might use MatCap images that have multiple spheres.

[@snark567]

@@BenCloward Thanks for the reply! Yeah it was the math, I forgot to add 0.5 in add. Lack of sleep really gets you sometimes haha

[@lilyye9373]

I use URP instead of HDRP: 10 seems right, 31 seems wrong.