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Nice engine :-)

Started by richardve Dec 21, 2000 at 10:57 AM 52 replies 4.3k views

Original Post

Dec 21, 2000 at 10:57 AM

Hi tim, I''ve downloaded your new engine and it looks very cool! Wish I could swim in that water!

(only a little bit slow, 30 FPS while looking at the sky (calculating to much?)) my system: PIII 500 128 MB GeForce2 MX (Hercules) 15/30 FPS (640-480) Just wanted to say this..

btw. Why don''t you make a little (or big

) game with this engine? I think you''ve got more than enough talent to do this.

tcs

Dec 21, 2000 at 11:07 AM

I never stop recalculating the water normals, because I don''t have any LOD visibility scheme vor the water. It only isn''t rendered when you can''t see it. So when you can''t see the water you probably don''t need to see anything else, so FPS doesn''t matter. I''ll take this seriously and try to improve the situation in the next update !

Tim

--------------------------
glvelocity.gamedev.net
www.gamedev.net/hosted/glvelocity

tcs

Dec 21, 2000 at 2:48 PM

Many people ask me about that game thing. I just don''t want to set myself to high goals. Doing a game requires a hell lot more time than just doing a tech demo or similar. While I think that I have all the theoretical knowledge, putting all this together and staying focussed is another thing ;-) And maybe I just have more fun doing small procjects

Tim

--------------------------
glvelocity.gamedev.net
www.gamedev.net/hosted/glvelocity

Blade Runner

Dec 21, 2000 at 4:34 PM

Is the flickering normal or did i do something wrong with my video card settings?

Almost my system:
550Mhz AMD Atholon
128MB SyncDRAM
3dfx Voodoo3 1000 2x AGP 3D Graphic card with the latest whql drivers.
I guess that's all.

Edited by - Blade Runner on December 21, 2000 5:37:31 PM

tcs

Dec 21, 2000 at 7:41 PM

You have a 3Dfx card, I guess that no demo on my site runs good with Voodoo cards. They have really crappy OpenGL ICDs and even the V5 5500 can''t compete with three year old TNT1 in terms of features. This demo is especially problematic since it was intented to run on GeForce cards, and intented to run well only on GeForce2 cards...

Tim

--------------------------
glvelocity.gamedev.net
www.gamedev.net/hosted/glvelocity

Blade Runner

Dec 21, 2000 at 8:34 PM

Ok i see. I''ve been trying to get my mom to upgrade to a newer video card but she''s so slow about it, but hay maybe she already has it but as a Chrismas present hasn''t told me. I was going for a Voodoo5 5500 but I have been thinking aobut looking at the specs on the GeForce cards so maybe I''ll do that now. Your wrong about one thing the Velocity one runs on my computer and so does the one that''s in the cube running around in the cube with a gun, and a few others. I also have Dx8 drivers. Although the demo flickers I''ll still play with it and take a look at the source.;->

zedzeek

Dec 21, 2000 at 9:02 PM

u r aware that 3dfx r out of business i take it. which means no more driver updates.

BTW nice program TCS it ran a little slow on my computer but im sure with a little tweaking u can increase the fps by a factor of 3 at least.
( one complaint though i hate programs that start up in fullscreen my monitor when its forced to run at 60hz emits a high pitched scream like its gonna explode )

http://members.xoom.com/myBollux

tcs

Dec 21, 2000 at 9:36 PM

Yeah, their drivers need MUCH work and now you don''t even get any updates for them...

Oh, and 3 times the FPS !?!?!?! I''m already using compiled vertex arrays and idexed primitves, how would you try to archive such a speed up ? I''m can''t believe it, but I''m iterested ;-)

Tim

--------------------------
glvelocity.gamedev.net
www.gamedev.net/hosted/glvelocity

tcs

Dec 21, 2000 at 10:37 PM

If somebody realla wants to help, tell me how I can speed up this code, a big bottleneck for some reason:

  
void CWater::Wave(DWORD dwTimeElapsed)
{
	//////////////////////////////////////////////////////////////////////

	// Animate the mesh

	//////////////////////////////////////////////////////////////////////


	unsigned short int i, j;
	float fD;
	float fScaledSpeed;

	// Calculate the scaled speed

	fScaledSpeed = (m_fWaterSpeed / 1000.0f) * dwTimeElapsed;

	// Reset the force

	for (i=0; i<m_iTesselation; i++)
		for (j=0; j<m_iTesselation; j++)
			m_pWaterMesh<i>[j].fForce = 0.0f;

	// Animate

	for (i=1; i<m_iTesselation-1; i++)
	{
		for (j=1; j<m_iTesselation-1; j++)
		{
			// if (m_pWaterMesh[i][j].bVisible == false)

			//	 continue;


			fD = m_pWaterMesh[i][j].fVertex[1] - m_pWaterMesh[i][j - 1].fVertex[1];
			m_pWaterMesh[i][j].fForce -= fD;
			m_pWaterMesh[i][j - 1].fForce += fD;

			fD = m_pWaterMesh[i - 1][j].fVertex[1] - m_pWaterMesh[i - 1][j].fVertex[1];
			m_pWaterMesh[i][j].fForce -= fD;
			m_pWaterMesh[i - 1][j].fForce += fD;

			fD = m_pWaterMesh[i][j].fVertex[1] - m_pWaterMesh[i][j + 1].fVertex[1];
			m_pWaterMesh[i][j].fForce -= fD;
			m_pWaterMesh[i][j + 1].fForce += fD;

			fD = m_pWaterMesh[i][j].fVertex[1] - m_pWaterMesh[i + 1][j].fVertex[1];
			m_pWaterMesh[i][j].fForce -= fD;
			m_pWaterMesh[i + 1][j].fForce += fD;

			fD = (m_pWaterMesh[i][j].fVertex[1] - m_pWaterMesh[i + 1][j + 1].fVertex[1]) * SQRT_OF_TWO_INV;
			m_pWaterMesh[i][j].fForce -= fD;
			m_pWaterMesh[i + 1][j + 1].fForce += fD;

			fD = (m_pWaterMesh[i][j].fVertex[1] - m_pWaterMesh[i - 1][j - 1].fVertex[1]) * SQRT_OF_TWO_INV;
			m_pWaterMesh[i][j].fForce -= fD;
			m_pWaterMesh[i - 1][j - 1].fForce += fD;

			fD = (m_pWaterMesh[i][j].fVertex[1] - m_pWaterMesh[i + 1][j - 1].fVertex[1]) * SQRT_OF_TWO_INV;
			m_pWaterMesh[i][j].fForce -= fD;
			m_pWaterMesh[i + 1][j - 1].fForce += fD;

			m_pWaterMesh[i][j].fForce -= fD;
			m_pWaterMesh[i + 1][j - 1].fForce += fD;
		}
	}

	for (i=0; i<m_iTesselation; i++)
	{
		for (j=0; j<m_iTesselation; j++)
		{
			m_pWaterMesh[i][j].fVelocity  += m_pWaterMesh[i][j].fForce * fScaledSpeed;
			m_pWaterMesh[i][j].fVertex[1] += m_pWaterMesh[i][j].fVelocity;
			m_pWaterMesh[i][j].fVertex[1] -= m_pWaterMesh[i][j].fVertex[1] / m_iTesselation;
		}
	}
}

Tim

--------------------------
glvelocity.gamedev.net
www.gamedev.net/hosted/glvelocity

Blade Runner

Dec 22, 2000 at 12:04 AM

Hay zedzeek I thought 3dfx was bought out by Nivida which meant in my mind was that although they were bought out they would still make driver updates for one of their newer video cards? Now what card shall I buy if thats true that they will not make any driver updates?

richardve

Dec 22, 2000 at 1:13 AM

quote:
Original post by tcs

If somebody realla wants to help, tell me how I can speed up this code, a big bottleneck for some reason:

Tim

--------------------------
glvelocity.gamedev.net
www.gamedev.net/hosted/glvelocity

Wow, I got 80 FPS when I removed that code..
I can''t promise you that I can get it any faster but I''ll try..

zedzeek

Dec 22, 2000 at 2:17 AM

nvidia doesnt have to support 3dfx cards in anyway. which really sux if youve just brought a voodoo5.

http://members.xoom.com/myBollux

tcs

Dec 22, 2000 at 9:08 AM

Yeah, I tested all my functions and this one really sucks ;-)

I guess you can say your Voodoo card goodbye when Whistler is released...

Tim

--------------------------
glvelocity.gamedev.net
www.gamedev.net/hosted/glvelocity

mrfujiak

Dec 26, 2000 at 12:58 PM

Whistler? this an Nvidia card?

revolver

Dec 26, 2000 at 5:38 PM

Whistler is next-gen stuff coming out of Microsoft new OS, .NET, dev tools, etc. etc.

Redeema

Dec 27, 2000 at 8:18 AM

hi Tim!

Nice work, but it seems that this Engine is not running under
Windows 2000, or is GeForce a requirement?

tcs

Dec 27, 2000 at 11:04 AM

My two dev. systems are Win2k/GeForce systems... The demo is intended for GeForce cards. I got reports that it works fine on TNT2/Radeon cards, but you have to disable the cubic environent mapping of the water. Strange, since the Radeon supports Cubic Environment Mapping...

Tim

--------------------------
glvelocity.gamedev.net
www.gamedev.net/hosted/glvelocity

tcs

Dec 28, 2000 at 5:00 AM

Yes, maybe the adds/subs take some performance. The usual size of the water mesh (tesselation) is 100x100. I have an option to skip the points that are hidden by the terrain, but I can''t to frustum culling or HSR... I got a big speed boost by optimizing the data storage, but I''m still sure it could be a lot faster

Tim

--------------------------
glvelocity.gamedev.net
www.gamedev.net/hosted/glvelocity

XBTC

Dec 28, 2000 at 11:05 AM

Hi!
Sorry no answer....
I know the original water code from lonerunner but as yours it comes without description....I completely understand your and lonerunner´s code but I don´t really understand why and how it works....Can you give me a little rough description what exactly the algo does?Especially the stuff in the two nested for loops after // Animate.

Thanx in advance, XBTC!

Edited by - XBTC on December 28, 2000 5:41:05 PM

ImmaGNUman

Dec 28, 2000 at 11:26 AM

Im no expert, but it looks like

------------------------------
for (i=0; i for (j=0; j[j].fForce = 0.0f;
-------------------------------

can be combined with

-------------------------------
for (i=0; i{
for (j=0; j {
m_pWaterMesh[j].fVelocity += m_pWaterMesh[i][j].fForce * fScaledSpeed;
m_pWaterMesh[i][j].fVertex[1] += m_pWaterMesh[i][j].fVelocity;
m_pWaterMesh[i][j].fVertex[1] -= m_pWaterMesh[i][j].fVertex[1] / m_iTesselation;
}
}
---------------------------------

so, instead of looping that twice, just loop it once with all that code.

-----------------------------

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