Almost finished With lerps, decided to take a break and ask questions the forumįloat fDawnToSunrise = lerp(Dawn, Sunrise, DawnSunriseLerp) įloat fNightToSunrise = lerp(Night, Sunrise, NightDawnLerp) Midnight -> Noon = Count forwards (0 -> 1), Noon -> Midnight = Count backwards (1 -> 0)įloat fSunsetDuskMax = 0.2516 //362.4 (17:56 = 6:04, Counting backwards from 1.0) minutes dividedįloat fDaySunsetLerp = clamp(dot(fSunsetDuskMax, fSunsetDuskMin), 0, 1) Noon ENightDayFactor = 1.0000, midnight = 0.0000įloat fDaySunsetMax = 0.6725 //968.4 (16:14) minutes dividedįloat fDaySunsetLerp = clamp(dot(fDaySunsetMax, fDaySunsetMin), 0, 1) įloat fSunsetDuskMin = 0.6724 //Juuust after sunset. Here's what I've come up with, sticking as close as possible to Boston's dawn, sunrise, sunset, dusk and night hours.įloat fDawnSunriseMin = 0.2652 //382 (6:38) minutes divided by 1440įloat fDawnSunriseMax = 0.4260 //426 (7:10) minutes dividedįloat fDawnSunriseLerp = clamp(dot(fDawnSunriseMin, fDawnSunriseMax), 0, 1) įloat fSunriseDayMin = 0.4261 //Just after sunriseįloat fSunriseDayMax = 0.9999 //Want the time riiiiiight before noonįloat fSunriseDayLerp = clamp(dot(fSunriseDayMin, fSunriseDayMax), 0, 1) įloat fDaySunsetMin = 1.0000 //Noon = 12:00, 12 * 60 = 720. But is this really the best way to get a time of day Lerp? And how do I calculate the lerp counting backwards from noon to midnight (1 -> 0)? What I've done, is used clamp(dot()) to calculate the lerps. And I didn't get this far in algebra, when I was in high school. What should the DaySunriseLerp/etc variables be? Some sort of strange ENightDayFactor formula? Started working on one, but damn, this is complicated. ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++įloat fDawnToSunrise = lerp(Dawn, Sunrise, DaySunriseLerp) įloat fSunriseToDay = lerp(Sunrise, Day, SunriseDayLerp) įloat fDayToSunset = lerp(Day, Sunset, DaySunsetLerp) įloat fSunsetToDusk = lerp(Sunset, Dusk, SunsetDuskLerp) įloat fDuskToNight = lerp(Dusk, Night, DuskNightLerp) įloat fNightToSunrise = lerp(Night, Sunrise, NightSunriseLerp) The only way to put it in enbeffect.fx is to put it before anything else, before any other color ops including tonemapping.
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The main reason you can't use enbeffect here is that it doesn't support multipass, and shaders that scrambled coord requires output from previous stage on full frame instead of just current pixel. Frame constants however (like "xs"), being the same value for every vertices, can be put into vertex shader because interpolation to same value only returns the same.ĮNBEffect.fx and effect.txt are different to each others in many aspect, and those difference make them suit for different scenario.
So back to the case, what it does here is a per-pixel operation, returning different coordinate for different pixel and not just linear interpolation, so the Vertex Shader can't do much here.
A huge, out of border triangle that we only use the square part in its full coverage.Īnd then, the texcoord of vertices will be interpolated internally for pixel shader in rasterizer stage Pretty much like to define where our canvas are.įor a full screen quad, it only execute 4 or 6 times per frame(either a quad or count as two triangle) First, Vertex Shaders calculate where the vertices are for texcoord mapping per vertex.
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