Drezil/htrace
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implemented phong-shading. Vertex-normals are wrong interpolated

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This commit is contained in:
Nicole Dresselhaus 2014-12-03 21:42:32 +01:00
parent 181353e161
commit 084069e0a9
2 changed files with 24 additions and 5 deletions
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3
src/Main.hs
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@ -108,11 +108,10 @@ main = do
putStrLn $ "reading and parsing "++ show a
!f <- B.readFile a
r <- runEitherT $ validateAndParseScene f (dropFileName a)
print r
case r of
Left error -> putStrLn $ "Error: " ++ error
Right s -> do
putStrLn "redering..."
putStrLn "rendering..."
let (w,h) = (width . sceneCamera $ s, height . sceneCamera $ s)
imvec = fromList ((render w h s <$> [0..w*h-1]) `using` parListChunk w rseq)
im = generateImage (v3ToPixel w imvec) w h

26
src/Scene/Renderer.hs
View File

@ -146,7 +146,7 @@ intersect r@(Ray ro rd) m@(M (Mesh s _ v f vn fn b)) = case catMaybes . elems $
where
possHits = if inBounds b r then case s of
Flat -> hitsFlat v fn `IM.mapWithKey` f
Phong -> IM.fromList [] --hitsPhong v n <$> f
Phong -> hitsPhong v vn fn `IM.mapWithKey` f
else
IM.fromList []
inBounds :: BoundingBox -> Ray -> Bool
@ -174,7 +174,7 @@ intersect r@(Ray ro rd) m@(M (Mesh s _ v f vn fn b)) = case catMaybes . elems $
hitsFlat verts norm f (V3 w1 w2 w3) =
if det == 0 || t < epsilon || not det2
then Nothing
else Just $ Collision pos (norm IM.! f) t m
else Just $ Collision (pos+10*epsilon *^ (norm IM.! f)) (norm IM.! f) t m
where
! det = dot rd' (norm IM.! f) --do we hit the plane
rd' = normalize rd
@ -188,7 +188,27 @@ intersect r@(Ray ro rd) m@(M (Mesh s _ v f vn fn b)) = case catMaybes . elems $
-- vectors are linear independent.
det2 = det2v ^. _x >= 0 && det2v ^. _y >= 0
&& det2v ^. _x + det2v ^. _y <= 1
--hitsPhong :: IntMap (V3 Float) -> IntMap (V3 Float) -> V3 Int -> Maybe Collision
hitsPhong :: IntMap (V3 Float) -> IntMap (V3 Float) -> IntMap (V3 Float) -> Int -> V3 Int -> Maybe Collision
hitsPhong verts vnorm fnorm f (V3 w1 w2 w3) =
if det == 0 || t < epsilon || not det2
then Nothing
else Just $ Collision (pos + 10*epsilon *^ vns) vns t m
where
! det = dot rd' (fnorm IM.! f)
rd' = normalize rd
t = (dot ((verts IM.! w1) - ro) (fnorm IM.! f))/det
pos = ro + t *^ rd'
v1 = (verts IM.! w2) - (verts IM.! w1)
v2 = (verts IM.! w3) - (verts IM.! w1)
det2m = fromJust $ inv33 $ transpose $ V3 v1 v2 (fnorm IM.! f)
det2v = det2m !* (pos - (verts IM.! w1))
det2 = det2v ^. _x >= 0 && det2v ^. _y >= 0
&& det2v ^. _x + det2v ^. _y <= 1
vns = (sqrt (sqr ( det2v ^. _x) + sqr ( det2v ^. _y))) *^ (vnorm IM.! w1)
+ (sqrt (sqr (1 - det2v ^. _x) + sqr ( det2v ^. _y))) *^ (vnorm IM.! w2)
+ (sqrt (sqr ( det2v ^. _x) + sqr (1 - det2v ^. _y))) *^ (vnorm IM.! w3)
sqr = \x -> x * x
-- deprecated - wrong calculation of rays.
rotCam :: Float -> Float -> Int -> Int -> V3 Float -> V3 Float -> Float -> V3 Float