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A Game Developer also plays some guitar

Author Archives: Benny Chen

A game developer, a music lover, and a partisan fan of F.C. Barcelona

上周末的踢球

August 24, 2009 10:39 pm / Leave a Comment / Benny Chen

上上周末的球赛,8V8的比赛,结果我们队包括我在内居然总共只去了8个人,而对手“川渝老乡”队浩浩荡荡的有二三十人的样子(这可是以往我们的阵势),但最后的结果却是我们6:3取得的一场畅快的胜利,以少胜多,哈哈!

上面的照片是上周末踢球的照片,上周又回到了民大的球场,因为是队内的训练赛。每周坚持这样踢下来,一点一点的找回了很久以前的状态,感觉很不错。

Posted in: FCB BJ / Tagged: barca, Beijing, 踢球

Spanish Super Cup Champions

August 24, 2009 10:12 pm / Leave a Comment / Benny Chen

supercopa_r2_c2

FC Barcelona beat Athletic Bilbao 3-0 at the Camp Nou to secure their 8th Supercopa de España trophy. Two goals from Lionel Messi and one from Bojan earnt the Catalan side the 5-1 aggregate win.

The trophy is contested between the winner of the Spanish league, and the winner of the Copa del Rey. However since FC Barcelona won both last season, the club played the Copa del Rey runners-up Athletic in the two-legged tie.

巴塞罗那俱乐部在诺坎普以3:0击败了毕尔巴鄂竞技队,获得了他们的第8座西班牙超级杯。梅西的梅开二度和博扬的入球帮助加泰罗尼亚的球队在两回合的比赛中以总比分5:1取胜。

西班牙超级杯原本是由西班牙的联赛冠军和国王杯冠军进行较量,不过在上个赛季,巴萨独揽了这两座奖杯,所以在这两回合的比赛中巴萨的对手是国王杯的亚军毕尔巴鄂竞技队。

Posted in: Visca Barça / Tagged: barca, spanish super cup

Inmusic Festival

August 21, 2009 8:51 pm / Leave a Comment / Benny Chen

这是两周前,我,小xing,小ber,3人奔赴张北音乐节的部分照片。这两周实在是太忙了,到今天才有时间整理了一些照片。

这就是传说中的张北“荒原”音乐节,一个来回花了我们10个多小时车程的破地方,有的只是到处的荒草和沙子,从北京骗来了一群傻子,花钱花力,体验这样一个粗糙的原野的组织混乱的音乐节。

不过怎么说呢,人生就是需要体验的,即便有时是如此的糟糕。

Posted in: A Day in the Life / Tagged: inmusic festival

要开始“叛逆”了

August 2, 2009 9:27 pm / 1 Comment / Benny Chen

s3232450今天特激动,因为买到了一本好书,一本厚度可以和《新华字典》有得一拼的书——《来自民间的叛逆》。

这本书是讲美国半个多世纪的传奇的民歌历史,对于这份历史已经略知一二以及对于那些音乐家的大名耳熟能详的我,通过阅读这本书,能够更详尽的了解美国民歌,攫取到那一首首打动我的歌曲背后的故事。

美国民歌,英文是American Folk,不过在中国,似乎称之为民谣比较贴切。因为“民歌”这两个字,在中国,被春晚那些歌功颂德的严重脱离了大众的歌曲所污染,挂着羊头卖狗肉。民歌,顾名思义,应该是人民的歌,来源于人民,一般紧密联系于社会议题,为人民歌唱(不是为领导歌唱),并在人民中传唱。而这本书的前言部分也着重强调了这个,我引用一段:

真正的民歌大都是很美的。按照民歌的传统定义,民歌是指流传至今,没有(或者说不知道)作者的歌曲。在没有广播电视排行榜的古代,一首歌要是能流传下来,没法靠炒作,必定得有很多人喜欢才行。也就是说,民歌是经过时间检验的东西。可现在的许多所谓“晚会民歌”都是几个专业作者为了响应某个号召而写的,并由晚会导演们为了搞平衡而硬推出去的.许多歌曲没有群众基础,这样闭门造车似的造出来的东西当然不会有多少人喜欢。

美国民歌,是我最为喜爱的两种音乐风格之一(另一个是布鲁斯)。我喜欢他的形式,任何人,你不必拥有一副好嗓子,只要你有一副嗓子,就可以拿起一把吉他,去表达自己歌唱生活。也正如这本书的标题所写的,它大多歌唱的是我们生活的不幸(也因为我们的生活大多数时候是不幸的),歌唱来自于民间的叛逆。

我准备花一段时间好好的去拜读这本近700多页的美国民歌圣经,来自于博客名人——土摩托的书。

Posted in: Music Heaven / Tagged: 来自民间的叛逆

Unproject

July 30, 2009 11:19 am / 1 Comment / Benny Chen

Unproject即反投影,将一个坐标从投影空间中反投影到视图空间。对于Project操作,很容易,直接用投影矩阵乘以视图空间的坐标即可,即:

posProj = posView * matrixProj

其中设posView = (x, y, z, 1)是视图空间的某一位置点的坐标,posProj = (x’, y’, z’, w’)为投影空间中该点的坐标,matrixProj为投影矩阵。我们知道,因为投影矩阵的特殊性,有w’ = z,即视图空间的深度值存储在投影空间的w值中,这样posPorj的xyz坐标值在除以了w值之后,就有了近大远小的透视效果。注意:只有在除以了w值之后才会有,x’/w’,y’/w’∈[-1,1]且z’/w’∈[0,1],即在那个所谓的半个正方体中了。

那么对于Unproject操作呢,是不是直接posView = posProj * inverse( matrixProj )就可以了呢,如果知道x’y’z’w’值,当然是正确,但关键问题是,大多数情况下,我们所知道的只是x’/w’,y’/w’以及z’/w’的值。

DX提供了一个函数D3DXVec3Unproject,可以做反投影,不过它只能在C++代码里使用(shader里没法使用),而且需要注意的是,这个函数是对屏幕空间的坐标进行的反投影(所以这个函数还需要传入一个viewport参数),务必不要将投影空间的坐标作为参数传递给这个函数。

我需要写一个自己的反投影函数,不妨从上面的这个公式推导:posProj = posView * matrixProj,因为我们现在已知的是x’/w’,y’/w’以及z’/w’的值,不妨设posProj’ = (x’/w’, y’/w’, z’/w’, 1 ),所以这个公式改为:posProj’ * w’ = posView * matrixProj。

因为一般投影矩阵是像这样一种形式:

projmatrix

于是有拆分posProj’ * w’ = posView * matrixProj后,有:

posProj’.x * w’ = posView.x * xScale;
posProj’.y * w’ = posView.y * yScale;
posProj’.z * w’ = posView.z * Q – Q*zn;
w’ = posView.z

上面构成一个方程组,解这个方程组,可得:

posView.z = Q*zn / ( Q – posProj’.z )
posView.x = posView.z * posProj’.x / xScale
posView.y = posView.z * posProj’.y / yScale

至此反投影完毕。

反投影一般比较常见的是在鼠标拾取(picking)的例子中,而那里投影空间的点取的是近屏幕上的点(posProj’.z = 0),因为这样上面的公式就会得到一个比较简化的特例:

posView.z = zn
posView.x = posProj’.x * zn / xScale
posView.y = posProj’.y * zn / yScale

Posted in: Computer Graphics / Tagged: D3DXVec3Unproject, unproject, 投影矩阵, 投影空间, 视图空间

Camp Nou gives Ibrahimovic a hero’s welcome

July 28, 2009 9:01 pm / 1 Comment / Benny Chen

Zlatan Ibrahimovic has been welcomed by a rapturous Camp Nou. The Swedish striker was stunned by such a grand introduction to the club, saying that the only moments of his life to compare with this were the births of his children.

伊布拉希莫维奇在诺坎普受到了如斯疯狂的欢迎。被如此隆重的介绍给俱乐部,这位瑞典前锋也感到受宠若惊,他说,在他的一生中,只有他的孩子出生的时候,才能和此刻相比。

2009-07-27_presentacion_zlatan_ibrahimovic_004No fewer than 60,000 people assembled in the Camp Nou on Monday evening to get their first glimpse of the new Barça centre forward. The Swede was given an enthusiastic welcome by a generally young crowd that enjoyed every second of the presentation.

星期一晚,为了能够尽快目睹这位巴萨新任中锋的风采,至少有6万名球迷涌入了诺坎普体育场。到场的球迷中,大多数都是年轻人,他们享受着当晚的每一秒种,并给予了瑞典人最热烈的欢迎。

Great expectations

Hours before the Camp Nou opened, there were already several fans gathered on the forecourt outside the stadium, all waiting to attend the presentation of the club’s latest acquisition, Ibrahimovic. In fact, the gates had to be opened half an hour before the event commenced in order to avoid a crush as the crowds made their way to the terraces.

The event actually got under way a little later than originally planned, but it was clearly worth the wait when around nine o’clock, the striker finally made his way out onto the pitch for the first time.

巨大的期望

就在体育场还没有开放之前,就已经有一些球迷聚集在场外,他们迫切的等待着参加俱乐部的最新引援伊布的亮相仪式。而事实上,由于大批球迷涌向看台,体育场的大门也不得不在仪式开始前半个小时就开启,以防止拥挤事故的发生。

仪式最终开始的时间比预计晚了一些,但是球迷们的等待绝对是值得的。晚上9点整,瑞典前锋终于首次踏上了诺坎普的球场。

Nine on his back

After an intense day, with two medical revisions and the signing of his contract, Zlatan appeared before the media donning the number nine shirt that is to be his own. With the cameras flashing in the stands and the club anthem playing over the tannoy, the former Inter man impressed onlookers with his juggling skills and returned the applause from the crowd. He also kissed the crest on numerous occasions.

新任9号

这一天的行程对于伊布来说是异常密集的,他首先要接受两个体检,接着需要进行合同的签署,最后才在晚上,身披着即将属于他自己的9号球衣,在诺坎普正式亮相。伴随着看台上此起彼伏的闪光灯拍摄和广播里雄壮的巴萨队歌,伊布用杂耍般的技艺令观众叹为观止,并得到了热烈的掌声。这位瑞典人还数次亲吻了胸前衬衫上的巴萨队徽。

Words of thanks

The Swede then took the mike into his own hands and even said a few words in Catalan: “Gràcies a tots. Visca el Barça!” That worked the crowd up into absolute frenzy, and they immediately responded by chanting his name, with Ibrahimovic responding to such a warm reception by running the whole lap of the pitch, with several fans taking the opportunity to invade the pitch.

感谢之言

接着,伊布接过了麦克风,竟然说上了几句加泰罗尼亚语,这立即引发了球迷的一阵骚动,球场上开始一阵阵的回响起了瑞典人的名字。面对如此这般的热情,伊布也绕场跑动了一周,向场地四周的球迷致以谢意。有几个疯狂的球迷甚至企图冲入场内接近这位国际球星。

I’m the happiest man in the world

After he had left the field, the Swede spoke to Barça TV and www.fcbarcelona.cat in the player’s tunnel to express his thoughts: “There have been two unforgettable moments in my life – the births of my children. Now, this is the third.” Visibly contented and emotional, Ibrahimovic added: “I didn’t expect this. It’s a fantastic feeling. I am the happiest man in the world”.

我是世界上最幸福的人

在离开球场之后,瑞典人在球员通道接受了巴萨TV巴萨官网的采访,他描述了自己的心情:“这一生,只有两个时刻让我难忘,那就是我的孩子出生的时候,但现在,这将是第三个令我终生难忘的时刻。”伊布看上去非常的开心而激动,他继续说道:“这一切太令我意外了,这种感觉太美妙了,此刻我觉得自己是世界上最幸福的人。”

Posted in: Visca Barça / Tagged: barca, Ibrahimovic

Thank you, Samuel

July 27, 2009 10:48 pm / 1 Comment / Benny Chen

The third highest goalscorer in Barça is leaving. But he can walk out the front door after five years at the club, winning almost everything on offer including last year’s memorable treble.

29-05-09_etoo_copas_01他,拥有着巴萨进球数量第3高记录的得分手,不得不和我们说再见了。但是,他绝对可以骄傲的昂首走出巴萨的大门,因为在诺坎普效力的5年里,他几乎为我们赢得了一切,包括上赛季那永恒难忘的三冠王。

It is time to say goodbye and thank you to Samuel. The Cameroonian striker, came to the club from Mallorca and is now headed for Inter Milan. In his five seasons, he has scored 130 official goals, making him the third highest goalscorer the club has ever had. Only César (235) and Kubala (196) top his record.

萨默尔,是时候和说再见了,并送上我们最诚挚的感谢。这位喀麦隆射手,从马洛卡来到了巴萨,而现在,他的下一个目的地将是国际米兰。在巴萨效力的这5个赛季里,他打进了130粒正式入球,这使他成为俱乐部历史上进球数量第3高的球员,仅次于塞萨尔(235)和库巴拉(196)。

Important goals

Eto’o will never be forgotten, not only for his character and dedication, but also his goals, many of which have proven decisive. Whenever called upon, he would respond, as he did in the final in Paris against Arsenal, where he scored the equaliser, or in Rome, where he opened the scoring against Man United (2-0).

重要的入球

埃托奥将被永远载入俱乐部的史册,不仅因为他优秀的个人品质和对俱乐部的孜孜不倦,更因为他所贡献的每一粒宝贵的关键进球。当球队需要他的时候,他总能挺身而出,不管是在巴黎的欧冠决赛赛场(攻入扳平阿森纳的进球),抑或是罗马(打进2:0对曼联的首球)。

Eight titles

Those goals meant two Champions league titles for Barça (2005/06 and 2008/09). But they were not the only wins for Eto’o in his time at the Camp Nou. He was also involved in the conquest of three leagues (2004/05, 2005/06 and 2008/09), a Copa del Rey (2008/09) and two Spanish Super Cups (2005/06 and 2006/07).

On an individual level, he was also top league goalscorer in 2005/06.

八座冠军奖杯

上面的这些关键进球意味着两座冠军联赛的奖杯(05/06和08/09赛季),但还远远不止这些。他还为诺坎普带来了三座联赛冠军(04/05,05/06和08/09赛季),一座国王杯(08/09赛季),以及两座西班牙超级杯(05/06,06/07赛季)。

至于个人荣誉方面,他也获得了05/06赛季的联赛最佳射手。

Setting standards

Samuel Eto’o came to Barça when Frank Rijkaard was manager. He was always a regular starter, playing both midweek and at weekends, and producing a constant flow of goals. He totalled 130 in 200 official outings, and average of 0.65 a match. Whether under Rijkaard or Guardiola, the African was always the main target man for all five years.

树立了旗帜

埃托奥是在里杰卡尔德时期来到了巴萨。不管是在周中还是周末的比赛中,他总是保持着定期的首发出场率,并且保持着持续数量的进球。在200场正式比赛中,他总共打入了130粒入球,场均进球率达到0.65。在这5年里,不管是在里杰卡尔德,还是瓜迪奥拉的执教下,埃托奥都是球队的核心球员。

Exemplary attitude

His goals were the result of his tremendous attitude. He never stop wanting to win more and more. His winning spirit and the huge demands he made of himself drove him though difficult situations, such as serious injuries that affected his seasons in 2006/07 (when he was injured against Bremen) and 2007/08 (when he was injured in the Gamper, against his future club Inter). But on both occasions he marked his return in the best possible way – by scoring goals.

To bid farewell, he also scored for Barça in the Champions League final and in the last game of the league season, at Riazor. Thank you, Samuel.

杰出的态度

他如此之多的进球来源于他对于工作杰出而敬业的态度。他从未停止过追求更多的胜利,他内心对于胜利强烈的渴望驱使着他度过 了一个又一个困境,战胜了困扰他的一个又一个伤病。他曾经先后在06/07赛季对阵不莱梅的比赛中,以及在07/08甘伯杯对阵国际米兰(也是他的未来东家)的比赛中受过重伤。但是,在两次伤愈后,他都用最强力的进球,向世人宣告他的回归。

在即将离开巴萨之际,他也用冠军联赛的入球以及联赛最后一轮在Riazor球场的进球,作了最好的告别。萨默尔,谢谢!

Posted in: Visca Barça / Tagged: barca, eto'o, samuel

Pre-season starts with a draw (1-1)

July 25, 2009 11:31 am / Leave a Comment / Benny Chen

barcelona-tottenham_01Barça drew their first pre-season game of the season against Tottenham Hotspur in the Wembley Cup. Pep Guardiola gave several players a chance to shine and Bojan Krkic scored for the Catalan outfit during the first half of an entertaining encounter.

巴萨在他们新赛季的第一场季前赛——在温布利杯对阵托特纳姆热刺的比赛中,收获了一场平局。在这场有些娱乐性的对抗中,瓜迪奥拉给了好几个球员表现的机会,博扬在上半场为球队取得了进球。

Kicking off the 2009/10 campaign, the Blaugrana produced a positive display in a game that saw them use 22 players as the team that began was completely replaced at half-time. No less than 15 of those players came from the club’s youth system, while Víctor Valdés, Rafa Márquez, Maxwell, Aliaksandr Hleb, Lionel Messi and Thierry Henry watched from the sides as they were not in the squad.

Despite the number of youngsters, Barça showed some great touches and enjoyed their fair share of possession against a Tottenham side that were playing in their fourth first-team friendly of the summer.

在这场拉开2009-10新赛季大幕的比赛中,红蓝军团展现了一种非常积极的面貌。上场比赛的球员一共达到了22人,因为在半场时,所有的 11人都得到了更换。至少有15名球员是来自俱乐部的青训系统,而瓦尔德斯,马奎斯,马克斯维尔,赫莱布,梅西以及亨利这些暂时还没有入队的球员,则直接在看台上观看了这场比赛。

尽管使用了相当多的年轻球员,但在这场与热刺的对抗中,巴萨还是体现了相当强大的触控球能力。这场比赛也是热刺一线队今夏的第四场赛季前热身赛。

Barça style

While the first match of pre-season is usually a casual affair, Barça had little time to settle down as the Wembley Cup ensured that the team faced a stern test and they stood up well. Guardiola’s side maintained their style and system as they played the ball around well in midfield against a side that ensured that their defence was well-manned. Early on there were few chances, but the best came in the 20th minute when Bojan saw his effort tipped wide by Carlo Cudicini in the Tottenham goal.

巴萨风格

虽然季前赛的第一场比赛一般是以一种随意轻松的态度去应战,但对于巴萨来说,时间不允许他们这么做,因为,温布利杯对于球队就是一场严峻的考验。但是他们经受住了考验,比赛中,瓜迪奥拉的球队保持了他们一贯的风格和系统,他们在中场出色的控球很好的遏制了对方,以确保他们防守组织的也很好。开场时,有好几个机会,最好的机会出现在上半场20分钟,博扬的射门被热刺门将库迪奇尼用指尖碰出。

Bojan opens the scoring

The Catalan striker did not allow the keeper to have any chance soon after as the ball fell to him six yards from goal and he stroked home the opening goal. Touré Yaya set up the effort with a super driving run that saw him skip past several Tottenham players before a tackle from Tom Huddlestone took the ball into Bojan’s path. It was the first goal of the pre-season for the Blaugrana and the second could have come soon after but Pedro was offside before beating Cudicini.

Towards the end of the first half, Tottenham raised their game and enjoyed two chances as Luka Modric struck the crossbar and soon after Benoit Assou-Ekotto saw his drive tipped over by Albert Jorquera.

博扬打破僵局

当皮球落到其跟前距离球门只有6码处的时候,加泰罗尼亚前锋这次没有给对方门将任何机会,一个抽射,帮助球队率先取得了进球。而这个进球主要归功于亚亚·图雷,亚亚从中场开始,以一股超强劲的盘带越过了好几名热刺的防守队员,直到哈德斯通的一个铲球使得球落到了博扬的脚下。这也是红蓝军团季前赛取得的第一个进球。他们本可以取得第二个进球,但是佩德罗的进球被吹罚了越位而取消。

在上半场临近结束时,热刺开始发威,并取得了两个进球机会,但是埃克托的射门被巴萨门将霍尔克拉用指尖碰出,而摩德利奇的射门则击中了横梁。

Livermore equalises

At the break Guardiola changed his entire team and part of the eleven that started the second period was Henrique, who made his debut alongside Marc Muniesa at the back for Barcelona. While the Blaugrana maintained their form, Tottenham’s changes ensured that they too altered their game and they were able to raise their game in the closing minutes. That pressure led to an equaliser as Assou-Ekotto’s centre from a short corner was met by Jake Livermore, who beat José Manuel Pinto to head home.

里维摩尔扳平比分

中场休息时,瓜地奥拉完全更换了球队的11人阵容,亨里克在下半场获得了出场机会,这也是他在巴萨的处子秀,他和穆尼艾萨搭档中后卫。巴萨维持了阵型,但热刺进行了一些调整,以确保他们能够更改比赛的局势并在比赛的最后时刻大举反攻。他们的持续施压取得的成效,在一次短角球战术中,埃克托的传中被里维摩尔顶进了平托把守的球门,扳平比分。

Posted in: Visca Barça / Tagged: barca, Pre-season, Tottenham Hotspur, Wembley Cup

顶点法线

July 23, 2009 4:27 pm / 2 Comments / Benny Chen

本来以为前一段时间写的3d max导出插件已经没有什么大的问题了,但有没有问题,完善不完善,真不是凭感觉就OK的,必须有足够广泛的测试用例测试后,才能够证明。

这不,最近开始研究并写一些光线跟踪的例子了,这当然离不开模型的法线,于是在进行当中我就发现,我的导出插件所导出的法线是不完善的。

在原来的插件中,我让顶点的法线就直接等于其所在的三角形面的面法线(多个面共享1个顶点,则会导出多个顶点,这些顶点位置相同法线不同),但对于光照模型,面法线只能支持到Lambert,为了支持Gouraud, Phong等其他模型,则必须使用顶点法线(为什么?稍后解释)。

这里提出了顶点法线和面法线,首先需要清楚的理解并区分这两个概念。

面法线很容易理解,即垂直于三角形面的一条法线。那顶点法线又从何而来呢,严格的从法线的定义上来说,其实顶点是不存在法线的,那为何又有顶点法线这个概念的。让顶点也拥有法线,是为了在光照计算时,能够在多面体的表面获得一种平滑的效果。

更具体的说,如果不使用顶点法线(就像我的3dmax导出插件原来就直接让顶点法线等于其面法线一样),一个三角形面的三个顶点的光照计算按照其所在面的面法线来计算,因为三个顶点的法线相同,则与光照方向求点积之后的结果也相同,这样三个顶点将会获得相同的光照效果,之后,光栅化再怎么插值,整个表面也都只是一种光秃秃的效果。(如图1)

而如果使用顶点法线,同一个面的三个顶点的法线就不一定相同了,这样通过光栅化后,就能在多面体的表面获得一种平滑过渡的光照效果。(如图2)

于是,弄清楚了这个后,我需要再次修改我的3dmax导出插件了,需要计算并生成新的顶点法线。那顶点法线该如何计算呢,对于这个我在这里就不详述,Max Wagner的《Generating Vertex Normals》这篇文章说的很详细清楚,从最简单的到逐步优化的生成算法一一都有介绍,可以去google找一下。

而3dmax的SDK开发文档里对顶点法线的计算也有介绍,3dmax提供了一个smoothing group的概念,这对于像立方体盒子这种表面并不是平滑过渡的模型,计算它们的法线将会带来很大的帮助。Wagner的文章里也说了,对于像立方体这样的模型,顶点法线不能简单的等于(共享该顶点的面的)面法线的平均值,因为这些面之间的过渡并不平滑。按照3dmax的概念,这些面不属于同一个smoothing group。何为smoothing group,这是3dmax根据表面之间的平滑过度情况,进行的分组。比如立方体,因为6个面之间两两都是相互不平滑的,所以一共会有6个smoothing group。每个面所属的平滑组的ID,程序员是可以直接读出的。

下面这两张图,是我在修改前和修改后的光照效果,对比很明显。

lambert 图1:基于面法线的光照

gouraud图2:基于顶点法线的光照

Posted in: Computer Graphics / Tagged: 面法线, 顶点法线

打破进球荒

July 19, 2009 3:57 pm / Leave a Comment / Benny Chen

7月17日我刚刚度过了我23岁的生日,果然给我带来了好运气,18号的踢球我就打破了进球荒,攻入了两球,助我们球队5:2战胜对手。

这场比赛的表现比前两场稳定很多了,确实前一段时间好好总结了一下并且通过加练取得了一定的效果,希望球队和自己都能踢得越来越好,取得更大的进步。

Posted in: FCB BJ / Tagged: 踢球

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