Daz研究報告-精液篇/Daz reserch-Cum (Pixiv Fanbox)

在H圖裡面，液體的重要性是無庸置疑的，其中精液又是非常關鍵的角色，一個好的精液可以讓畫面的色情度提升200%，身為一個顏射愛好者，自從開始做3DH圖以來我就不停的研究如何製作精液，不過一直沒有一個很滿意的結果。

In Hentai, the importance of liquid is indisputable, of which semen is a very key role, a good semen can make the picture erotic degree increased by 200%, as a facial enthusiast, I have been constantly researching how to make semen, but there has not been a very satisfactory results.

目前我嘗試過的精液做法主要有三種：

There are three main types of semen that I have tried so far:

1.3D模型

將實體的精液模型貼合在角色上，好處是無論攝影機轉哪個角度都沒問題，壞處是受限於模型本身，形狀很難做到完美，且很容易有邊緣僵硬的感覺，看得出是3D模型。

1.3D model

The advantage is that no matter which angle the camera turns, there is no problem. The disadvantage is that due to the limitations of the model itself, it is difficult to achieve a perfect shape and it is easy to have a stiff edge, so you can see that it is a 3D model.

2.3D貼圖

用Bump map、Displacement、Decal等方法，直接在材質上製作精液的效果，好處是方便快速，且能完美貼合，壞處是沒有真實的立體，受限於攝影角度，無法做出重量感。

2.3D Texture

Bump map, Displacement, Decal and other methods, directly on the material to create the effect of semen, the advantage is convenient and fast, and can be a perfect fit, the disadvantage is that there is no real three-dimensional, limited by the camera angle, can not make the sense of weight.

3.2D後製

直接將精液的素材後製到圖片上，好處是能最大幅度的做調整，且根據情況自由的增減，壞處是每做一張圖就要重複一次，並且由於是後製上去的，形狀和顏色很難完美契合畫面，多少會看出不自然感。

3.2D post-production

Post-production of semen texture to the picture, the advantage is to be able to make the largest adjustment, and according to the situation of free increase or decrease, the disadvantage is that every picture must be repeated, and because it is a post-production on the shape and color is very difficult to perfectly fit the picture, more or less will see the sense of unnaturalness.

目前為止我使用最多的是2D後製的做法，即使是模型及貼圖作法也都或多或少會混搭一下後製，但是2D後製的精液效果還是非常有限，很容易看出破綻之外，也較難表現出真實感，所以最近我又開始研究3D模型的做法。

So far I use the most is the 2D post-production practice, even if it is the model or texture method are more or less will mix with post-production, but 2D post-production semen effect is still very limited, it is easy to see the flaws and sometimes looks fake, so recently I have begun to study the practice of 3D model again.

以下是最新的研究成果—

Here are the latest findings-

精液模型部分使用的是dbxxx的Cum PRO Pack，不過我自己改了shader參數，以及最重要的改變：邊緣淡化！

The semen model part uses dbxxx's Cum PRO Pack, but I changed the shader parameters, as well as the most important change: the edge fade!

左邊是該模型原本的樣子，右邊是邊緣淡化後的結果。

可以看出原始狀態下有很嚴重的邊緣感，讓人意識到這是3D模型。邊緣淡化後，能更好的融入物體，有附著皮膚的感覺。

On the left is the model in its original state, and on the right is the result after the edge fade.

You can see that in the original state, there is a very serious sense of edges, which makes people realize that this is a 3D model. After the edge fade, it blends better into the object and has the feeling of being attached to the skin.

這邊也順便講一下，我覺得怎樣的精液須要注意哪些地方看起來更色情，首先是形狀，受重力影響自然下落強調重量感，分岔牽絲的強調黏稠感，再來是顏色，全白中稍微加進一點黃色以及透明度，以真實精液的樣子為基礎，稍微做一點誇張化。

By the way, let's talk about what I think it makes semen look more erotic. First of all, the shape, the natural fall due to gravity emphasizes the sense of weight, the bifurcation and traction emphasizes the sense of viscosity, and then the color, the all-white with a little bit of yellow added as well as the transparency, based on the real semen, with a little bit of exaggeration.

目前大概會全部的做法一起使用，貼圖用來做一個大面積的底，模型則是補足重量感和外型，最後有不足的地方再使用2D後製調整。

Currently, I'll probably use all of them together, the texture is used to make a large area for the base, the model is to complement the sense of weight and appearance, and then 2D post-production will be used to adjust any shortcomings.

補充關於「邊緣淡化」：

如果是unity的話，我知道有人寫出"Alpha blend"的shader，可以自動將模型接近其他物體的部分降低透明度，但是我不會寫shader所以我是用比較陽春的暴力解法，簡單說就是做一個透明度權重貼圖來讓模型的邊緣透明程度較高。

About "Edge Fade":

If it's unity, I know someone wrote "Alpha blend" shader, which can automatically reduce the transparency of the model part which close to other object, but I don't know how to write shader, so I'm using a stupid simple solution, which is simply to make a transparency weight map to make the model's edges more transparent.

步驟如下：

Step like this: