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knot場景的球滾起來卡卡的，像在玩彈珠台 #37

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xwc2021 opened this issue Feb 19, 2022 · 9 comments
Open

knot場景的球滾起來卡卡的，像在玩彈珠台 #37

xwc2021 opened this issue Feb 19, 2022 · 9 comments

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@xwc2021
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xwc2021 commented Feb 19, 2022 •
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原因是只取最近頂點的法向量(紫色)當作gravityDir
往邊邊移動時像撞到東西
其實是因為球如同在上坡
如同上坡

甜甜圈場景則是
先找出球Transform.podition到甜甜圈的最近點P，再用(P-Transform.podition)算出gravityDir(橘色)
滾起來相對流暢絲滑
donuts
@xwc2021
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xwc2021 commented Feb 19, 2022 •
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可以用很多空心義大利麵來組成knot嗎？
因為空心義大利麵其實就是
只取某段區間的甜甜圈

@xwc2021
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xwc2021 commented Feb 20, 2022 •
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knot
https://gpnnotes.blogspot.com/2022/02/blog-post_20.html

@xwc2021
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xwc2021 commented Feb 20, 2022 •
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取最近頂點的法向量會卡
那用碰撞的contactNormal呢？

物理引擎給的contactNormal
看起來不是三角形3頂點插值出來的結果

那就自行用contactPosition，求出三角形的重心座標，再用重心座標來插值Normal怎樣？
https://www.geogebra.org/m/wuwrqrxz

@xwc2021 xwc2021 changed the title knot場景的球滾的不順 knot場景的球滾起來卡卡的，像在玩彈珠台 Feb 20, 2022
@xwc2021
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xwc2021 commented Feb 21, 2022 •
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可就算contactNormal不是插值的結果
也不至於會出現上坡的情況阿？

總覺得是在頂點處撞到什麼東西呢 🤔
檢查一下Physics設定
layer_setting

取消「BorderNoAvoid」和「GravitySensor」(上圖位在knot頂點處的灰色小球)的碰撞後
不管是「取最近頂點法向量」還是「contactNormal」當gravityDir都沒問題了
前面的推理煞有其事是怎樣... 歸剛欸😝

@xwc2021 xwc2021 closed this as completed Feb 21, 2022
@xwc2021
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xwc2021 commented Feb 21, 2022

但是用重心座標來插值Normal當gravityDir
應該可以讓Camera的跟隨在knot上更加順暢

@xwc2021
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xwc2021 commented Feb 21, 2022 •
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最近頂點(紫色)周圍的鄰接三角形
頂點的鄰接三角形資訊

@xwc2021
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xwc2021 commented Feb 22, 2022

交界處可能有多個GravitySensor
所以要進行合體的動作
交界處

xwc2021 pushed a commit that referenced this issue Feb 22, 2022
交界處GravitySensor進行合體#37
89baca1
@xwc2021
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xwc2021 commented Feb 22, 2022 •
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差異是不是很大？
影片

@xwc2021
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xwc2021 commented Feb 22, 2022 •
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地本身不平怎辦？
影片

移動時不要把trasform.up和地面法向量對齊
會有明顯的改善

當從一塊四邊形移動到另一塊時
因為contactNormal和Gravity的方向沒對齊
還是會產生加速的感覺(沿著斜坡很下滑)

@xwc2021 xwc2021 reopened this Feb 23, 2022
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