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Freya Holmér 🔜 IndieCade Europe
@FreyaHolmer
, 3 tweets, 2 min read Read on Twitter
📏Lerp vs Slerp⭕

• Lerp interpolates in a straight line
• useful for interpolating positions

• Slerp rotates around (0,0)
• useful for interpolating directions

#unitytips
"But can't I just use lerp and normalize instead of slerp?"

for small angles, it might be good enough, but for large angles, their directions actually deviate quite a lot

here they are superimposed!
here's a bonus comparison between:

💙 = Vector Lerp
💜 = Vector/Quaternion Slerp
❤️ = Quaternion Lerp

(oh hey accidentally matched colors to #BiVisibilityDay 🎉)

also included the normalized version of vector lerp in faded blue!
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Freya Holmér 🔜 IndieCade Europe
@FreyaHolmer
A quick guide to Lerp~✨

Lerp is used to blend between two things!

It has three inputs: ( a, b, t )
a = start value
b = end value
t = how far we should go from start to end, as a percentage

Here it is in action!⚡blending a value, position, color and an angle!
If you're using Unity - make sure you use the Lerp appropriate for your use-case!

Mahtf.Lerp - values
Mathf.LerpAngle - angles
Color.Lerp - colors
Vector#.Lerp - positions
Vector#.Slerp - directions
Quaternion.Slerp - rotations

#unitytips
here's how to lerp mathematically!

a(1-t) + bt
weighted sum interpretation, where both contribute a total of 1, trading off influence

a + t(b-a)
this one originates from a, moving toward b by adding the displacement scaled by t

oh, and, these two are mathematically equivalent!
Read 7 tweets
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Freya Holmér 🔜 IndieCade Europe
@FreyaHolmer
found a sphere at the office!🔴

here's a quick demo of metallic reflections~

note how the color of the window's reflection on the sphere changes
even though the sphere is metallic red, it doesn't exclusively reflect red and absorb the rest, it depends on the angle

at a high grazing angle - only reds reflect

at a low grazing angle - all wavelengths reflect, hence all colors in the light from the window is preserved!
by the way - this happens with transparent materials as well, they too reflect light at low grazing angles!

for instance, look at the difference in transparency of the water at the shore vs the perfect mirror at the much lower angles further away

📸 by @nicolesy
Read 5 tweets
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Freya Holmér
@FreyaHolmer
A little thread on generating and rendering a procedural trajectory mesh! #madewithunity #unity3d
Trajectories under constant linear acceleration, gravity in our case, has a simple equation

p = p₀ + v₀t + ½gt²

p = Position
p₀ = Initial position
v₀ = Initial velocity
t = Time
g = Gravity
To get the velocity v at any given point, we derive the formula to get

v = v₀ + gt

Quite usefully, this vector is tangent to the curve! When normalized, it represents the direction of motion at any given time. In our 2D case, we can also get the normal by rotating it 90°
Read 9 tweets

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Ciro 치로 Continisio
@CiroContns
Small project I worked on last night to try and create a portal effect using the new Render Objects, available in Lightweight Render Pipeline since 6.6.0.
After a bit of fiddling with stencil, I managed to create what you see without one line of code (thread)
#unity3d #unitytips
Some context.
Render Objects give you the ability to customise the Renderer for LWRP. Basically, you use most of LWRP (shadows, culling, gizmos, stereo for VR…) - but with a few tweaks to how you do the final render.
This is more convenient than creating a pipeline from scratch.
Render Objects in particular allow you to render things in passes, and each time you can subvert aspects of the rendering: perform a different check on the depth, use stencil to mask objects, change the FOV, etc.

You can for instance have some objects render in front of others!
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Qalaat Al Mudiq
@QalaatAlMudiq
Breaking. SE. #Idlib struck tonight by incendiary bombardment, 1st time such weapon is used by pro-Assad forces since last Summer. #Syria. wikimapia.org/#lang=en&lat=3…
#Syria: video showing incendiary bombardment tonight on Tamanah (SE. #Idlib). 1st use of an incendiary weapon on Greater #Idlib since 7 months.
#Syria: video showing incendiary bombardment's direct hit on village of Tamanah in SE. #Idlib countryside. Apparently delivered by artillery.
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Shahriar Shahrabi
@IRCSS
#unitytips #screenshotsaturday (thread) Break down of how to achieve this timelapse effect in unity using procedural skybox and realtime vfx: rendering 3d skybox for VR, combining it with the standard procedural skybox, creating timelaps effect, LUTs and shadows on unlit mesh 1/7
First you need 6 cameras in 6 different directions (up, down, left, right, forward backward). The cameras render in to a renderTexture which are the six sides of a Cubemap shader. For VR make sure their target eye is None, so that it doesn't get synchronised with the HMD. 2/7
Now add a particle system for the stars, place it around your cubemap cameras, and set both on a layer so that they are not rendered by main cam. If you dont clear the buffer of the cameras and rotate the particle system, you get the time lapse effect. 3/7
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Connor Ratliff
@connorratliff
45 Days Of @ElvisCostello: a twitter megathread in anticipation of the Oct 12 release date of LOOK NOW, the new LP by Elvis Costello & The Imposters

This is either a bright idea or a brilliant mistake, but this is only, this is only, this is only the beginning...
I did something similar to this 5 years ago, in anticipation of EC & @theroots' Wise Up Ghost LP, on tumblr.

(You can still find all those posts if you look, although a lot of the YouTube links etc are now dead ends. It was 40 Days Of EC then, so for 2018 I'm upping it to 45.)
Mostly I will be going chronologically from the early years right up to the present, but it feels right to start out with Costello's 2002 song, "45."

Music Video directed by @jessebdylan


(There's an alternate "diner" version I can't find anywhere online)
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Ciro ☕️ ➡️ Gamescom
@CiroContns
Tried a little experiment I had in mind: create a shader that implements a dissolve based on dithering. Not perfect, but I got it running!
Made with #unity3d's ShaderGraph (more details in thread)
#gamedev #unitytips
This is a technique I've seen in a couple of recent games, including Mario Odyssey. Whenever Mario is obstructed or faded when camera is too close, dithering is used for these half-transparencies. Like here 👇🏻
Here's a couple of pics of the effect again. I have hand-drawn the texture, so it's not the best pattern ever :)
Read 5 tweets

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