Creme de la Creme
Complete List

Creme de la Creme

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Density Visualizations of an Isolated Galaxy

Uses the DensityCalculation with the following parameters:

The relatively small alpha scale is what causes this visualization to be so much better than the previous ones at InnerStructureSplattingHistory. It allows the opacity to not be saturated as quickly, which is what leads to a loss of information. Note the apparently very fast spinning center of the cloud and gas movies.

-- EdwardDale - 01 Jun 2006

Density Visualizations of Interacting Galaxies

Uses the DensityCalculation with a constant hue (red) with the following parameters:

As per StefanHarfst^?'s request, a constant hue was implemented for these movies to make density a bit more obvious. The result of this is that the alpha scale had to be turned up a bit and some detail was lost in the stars and clouds movies. A future movie set will seek to resolve this.

-- EdwardDale - 04 Jun 2006

Comparison of density rendering and point rendering of gas particles

This movie validates my density rendering using the DensityCalculation as being correct with respect to the point rendering. The same features are visible in both renderings, in particular a particle discharge at ~500myr.

-- EdwardDale - 05 Jun 2006

New stars created during the interaction betweeen two galaxies

This movie shows all stars that are created (tob>0) during the interacting galaxies simulation. This would appear to show the TidalDwarfGalaxies^?.

-- EdwardDale - 05 Jun 2006

Young stars created during the interaction between two galaxies

This movie shows all young (<50myr) stars on the right and all stars on the left during the interacting galaxies simulation. This would appear to show the TidalDwarfGalaxy^?. In particular, one can see a TidalDwarfGalaxy^? enter the left of the frame at ~750myr. New star production seems to cease at ~900myr when it nears the center of the system and seems to flare at ~1025myr after it has been slingshotted around. This pattern of star production after rounding the center of the system can be seen in numerous places and times.

-- EdwardDale - 05 Jun 2006

Complete List

flythrough2.avi A flight around the colliding galaxies.

-- EdwardDale - 12 Jun 2006

zoomout-recentstars-top.avi A look at the new stars formed by two galaxies interacting. This time, from twice as far away. Unfortunately, stars that go outside the bounds of the initial frame will be clipped as a result of how my data structure is implemented. This is something that should change over the weekend. The path of the TidalDwarfGalaxies^? is, however, a bit more visible than in previous movies.

agecolored.avi A first attempt at coloring stars based on their age. The scale on the right shows how the color relates to age. It needs to be static, instead of changing with respect to time. Also, there seems to be something else off about this movie. It definitely needs more work.

oldnewstars.avi This movie shows old and new stars in two panels. The TidalDwarfGalaxies^? are again readily seen. This time it is more obvious that they are composed of a large number of new stars.

ratio.avi This movie shows the ratio of new (tob>0) stars to old (tob<0) stars. Colors range from red to blue in with red being only old stars and blue being mostly new stars.

-- EdwardDale - 06 Jun 2006

gastob-cumul-interact-thumb.avi This movie shows all stars that are created (tob>0) during the interacting galaxies simulation. This would appear to show the TidalDwarfGalaxies^?.

gastob-recent-interact.avi This movie shows all young (<50myr) stars on the right and all stars on the left during the interacting galaxies simulation. This would appear to show the TidalDwarfGalaxies^?. In particular, one can see a TidalDwarfGalaxy^? enter the left of the frame at ~750myr. New star production seems to cease at ~900myr when it nears the center of the system and seems to flare at ~1025myr after it has been slingshotted around. This pattern of star production after rounding the center of the system can be seen in numerous places and times.

-- EdwardDale - 05 Jun 2006

gastob50topisoloated.avi Young (<50myr) stars on the right. Gas density on the left. Color is irrelavent, brightness is what matters.

gascomp-both.avi gascomp-density.avi gascomp-points.avi A comparison of a density rendering of gas particles with a point rendering. Looks much better than the one below because of the improved DensityCalculation. Also uses a constant hue instead of one that is a function of density. This makes the density a bit more obvious.

interact-comp.avi interact-stars.avi interact-gas.avi interact-clouds.avi interact-dm.avi Density visualizations identical to the previous ones except with the new, complete interact2 dataset from StefanHarfst^?.

-- EdwardDale - 04 Jun 2006

dm-sweep.avi Dark matter during the first timestep, with all to none of the particles randomly removed. Note that no structure emerges.

dm05.avi dm07.avi Dark matter over time, with 50% and 30% of the particles randomly removed. Note that no structure emerges and there is very little difference over time, as with the full dark matter movies.

skel-both.avi skel-skel.avi skel-points.avi The skeletonization of gas particles. It seems to pick out dense areas somewhat well. Notice how, as the gas gets more diffuse at the end of the movie, the skeleton also starts to show less structure.

-- EdwardDale - 31 May 2006

trans.avi trans-stars.avi trans-gas.avi trans-clouds.avi trans-dm.avi Density visualizations similar to the previous ones. This time, volume has been taken out of the equation. Because every cell in the Octree has an identical volume, it was removed. This leaves the sum of all the mass in each cell. This value is normalized to approximately 0..1 and raised to the 0.25 power, similar to what HP did. This value is converted to rgb and also used to determine opacity by multiplying it by 0.2. This is the key point of this visualization: the opacity of everything was dialed down a lot. Note the apparently very fast spinning center of the cloud and gas movies.

-- EdwardDale - 30 May 2006

gasstartob-top.avi gasstartob-side.avi A comparison between gas density and recently born (<10myr) stars. This would seem to confirm the idea that stars would be born out of areas very populated in gas.

gascomparison-top.avi gascomparison-side.avi A comparison between the point and density visualization of gas particles.

-- EdwardDale - 30 May 2006

firstmovie.avi Color is based on particle mass, scaled by 30000, and then converted using Hsb2Rgb. The opacity is a constant 0.2. All particle types are present.

secondmovie1.avi secondmovie2.avi The second two movies uses a mass per unit volume calculation where mass is the total mass (sum) in the volume of the fifth level of the Octree representation of the space. This means that each cube represents 1/(2^3*5) of the space. Each frame took a little less than 30 seconds to render. I believe only star particles are present. Rendered using IncorrectSplats^?.

0.mov splat1.mov splat2.mov splat3.mov splat4.mov Splats are colored based on particle velocity. Only stars are present. The two top sections use CutPlanes^? to slice away half of the unit cube nearest the viewer. This allows one to see the darker blue core. Uses a HueSaturationValueScale^?, so the dark blue is high velocity. Exact scale is unknown. Of some interest may be the fact that the yellow (slower) disc expands over the duration of the movie. It's unclear how to make this more obvious. Rendered with IncorrectSplats^?.

01.mov points1.mov points2.mov points3.mov points4.mov Similar to the movies HansPeterBischof^? has made here. Each particle is represented by a single point. The points in this movie appear to be slightly larger than his because of the loss of some detail in the stars section.

asdf0.mov A density-like graph. Density is scaled by 1/10E7 to bring it down to approximately [0, 1] and then raised to the 32nd power to emphasize the more dense areas and de-emphasize the sparser areas. This value is then used as input into Hsb2Rgb and the opacity of the splat. No longer has IncorrectSplats^?.

Interesting things:

• The stars seem to have a relatively constant outer density, but inside it is more dense. A CutPlane^? or a higher alpha farther away from the origin may reveal this more.
• The clouds starts off in two distinct shapes: a torus of slower? (rotationally over time), denser? particles with a ball of less dense particles in the center. At the end of the visualization, this distinction is blurrier.
• The gas section has a number of "bursts", the largest of which seem to happen around 500myr.

spin.avi dim-spin.avi Very early movies made for the Industrial Advisory Board meeting. Just a spinning snapshot.

tob.mov Point-based visualization of star particles <10myr old. A number of "bursts" are visible. Needs to be more zoomed in.

tob2.mov Splat-based visualization of star particles <10myr old shown next to the density visualization from asdf0.mov. The "bursts" are still visible.

-- EdwardDale - 24 May 2006