NVIDIA SDK 9.52 - Featured Effects

softStencilShadow

softStencilShadow Project

goochSlicer

goochSlicer Project

dilation

dilation Project

stencilShadow

stencilShadow implements vertex-shader shadow-volume extrusion and shows how to set up simple stencil shadowing in FX Composer

May 2005

cmykBloom

cmykBloom Project

psych_bg

psych_bg Project

gooch_shadow

gooch_shadow Project

drainBamage

drainBamage Project

April 2005

lineDraw

lineDraw Project

optical_distort1

optical_distort1 Project

bleach_bypass

bleach_bypass Project

duskHolga

duskHolga Project

titleOverlay

titleOverlay Project

February 2005

uvDetective

Shows uvDetective on a very simple model. Try it on any model of your own. UVDetective is a debugging/development shader that displays multiple useful facts about the UV coordinates on a model, and importantly shows the model's UV derivatives -- that is, how much stretching the UV's have in any part of the model. It also can display different exture MIP levels as varying colors. Finally and importantly, it has "TexRes" modes (techniques) that determine best texture resolutions based on a user-specified choice. For example, if the user specifies "256" then the display will show black where that resolution would be optimal, based on the current model and display size. Areas where a higher resolution could be used will be blue, while areas that could accept a lower resolution will be yellow

Debug

anaglyphic_stereo

Anaglyphic stereo view of a tree model -- use red/blue 3D glasses

Image Postprocessing

BRDFpaint

paint_brdf lets an artist work directly on BRDF lookup tables using a brush -- and while seeing the live results of the newly-created BRDF on any model, while they design it. Use the pulldown on/off flags to determine which part of the BRDF to paint, and then watch the results on-screen and in the textures panel. Just save the textures as DDS files for final use.

BRDF

January 2005

scroll

Side-scroll animation

Image Postprocessing

DebugCab

Geometry from NVIDIA's "Time Machine" truck, showing a variety of vertex values and scene coordinate systems encoded as colors and patterns. See the descriptions of the "SeeValues" and "SeeSpaces" HLSL shaders for more details

December 2004

ToksvigAA

ToksvigAA shows how to use texturing inside a BRDF, so that the anti-aliasing inherent in the texture engine can be used for arbitrary surface calculations. In this specific case, the specular highlight function is pre-calculated, and its values placed in a table (as a texture). The calculation is done by CPU-side HLSL code, just once before rendering begins. The values in this lookup table are then read as texture inputs by the BRDF. Since the complete shading function is pre-calculated, rather than just a portion, the texture antialiasing covers the entire high-freuqency highlight -- typical bump- or normal-mapping schemes would only antialias one or two terms of the specular function, which would still be high-frequency and would exhibit aliasing. Both AA and non-AA versions of the specular function are provided in the shader, as alternative techniques that can be easily compared in the shaded display.

Basic

November 2004

post_spot

A 2D effect that applies a "spotlight" to the entire frame using frame-buffer alpha blending, and then layers it with the "sepia" toning shader.. "post_spot"ontains simple spot and bumpy techniques, while "sepia" allows arbitrary color toning and/or desaturation of any color image.

hwShadowMap

"hwShadowMap" enables NVIDIA's built-in HW support for shadow-mapping from D24S8 depth textures (format "D24S8_SHADOWMAP") — this shadow mappng is faster than using floating-point surfaces and comes with built-in shadow filtering for top-notch results. The view frustum and render-to-texture tasks are maganed by macros from the header file "shadow_map.fxh" and bind automatically to the scene lamp. Setting the shader and setting the "Textures" source display to "scene" allows you to see the view from the shadow rendering pass, specified by a DXSAS "RenderPort."

Shadow

shadowSpot2

Spotlight with the cone angle defined by the shadow projection. Fast and flexible

relief_maps

"relief_maps" is a sample from our skilled friend Fabio Policarpo. It uses "relief mapping," an alternative to the usual bump or normal mapping. Not only does relief mapping disturb the surface normals, but also creates realistic geometric displacments in the shading -- and even casts shadows from those displacements.

Texture

displace_maps

Another great sample project from Fabio Policarpo. This sample uses textre-encoded displacement vectors to create the perspective illusion of displacement mapping without actually altering geometry

Texture

grisaille

From Siggraph 2004 - "grisaille" shading permits a simple numeric "flattening" of the overall shading, similar to engraved stone grisaille

shadow_fp_pcf

shadow_fp_pcf uses a floating-point frame buffer as a shadow map to delive the highest-quality shadow, based on percentage-closer filtering (PCF). Instead of using NVIDIA's built-in PCF function, this effect performs PCF in the pixel shader itself, using shader model 3.0 looping to permit a much larger number of samples and a softer-looking result.

chain

A simple industrial chain with two shaders, both featuring a cube reflection map. The metal chain links themselves use the fast and simple "metalRefl" shader and are tinted to look like common hardened steel. The chain cover, a flexible plastic tube, uses "BumpGlossed," which incorporates a bumpmap (the pattern gives the simple model complex bending, more like a flexible tube) and a fresnel-attenuated reflectivity (more like real plastic surfaces).

BRDF

dusk_gloom

"dusk_gloom" shows tricks you can try yourself, combining image layers by using the "ScriptExecute Sorter" subwindow of the FXComposer Materials pane. The complete effect is created by combining "post_bloom" with two copies of "post_negative": negative->bloom->negative to create "gloom" from the "bloom."

fluid

"fluid" is an image-processing effect. Be sure to "splash" using the mouse!

fire

Animated layered fire, based on Yury Uralsky's "Volumetric Fire" post on Cg Shaders.Org.
The shader revolves a cross section of a flame image around the Y axis to produce a cylindrical volume, and then perturbs the texture coordinates with 4 octaves of animated 3D procedural noise to produce the flame effect. This simpling is displayed on multiple parallel transparent camera-facing planes.

Texture

paintLiquid

paint_liquid is a tool similar to Photoshop's "liquify" command. Read any texture from disk, and then "paint" over it with the mouse — the underlying image can be freely distorted and warped in real time. This shader works best with GPUs that can support 16-bit floating point render targets, but will function on some older GPUs also — the distortion effect comes from painting an unseen extra texture, which is then used to perform a "dependant texture read" on the main input image.

Image Postprocessing

oneCycleSkin

"oneCycleSkin" combines a photographically-based texture of a single fingertip and the "painted sphere" technique to quickly get a lifelike appearance at a high fill rate

October 2004

paint_HDR

paint_HDR is much like a regular simple paint program, but the pixels it uses are based on 16-bit floating-point values. This makes it perfect for touching-up HDR files etc. This paint shader has two controls to manage brightness — one for the brightness of the brush (which can even be negative) and one for the brightness of the overall image exposure or "white level." Bright brush strokes may appear white, but ajusting the exposure can reveal their true colors. Thanks to the developer/artist at NVIDIA's GPU Jackpot who asked for this shader — making it from the existing paint_brush shader took less than an hour, right there at the event!

paint_blur

paint_blur is a nv4x-class demo of floating point buffers and indirect texture access. The mouse allows you to "liquify" an image in real time, but in this case the "liquified" image is blurred against the original image via an accumulation buffer, creating the complete paint-on motion blur effect

MrWiggleDot

The "MrWiggleDot" FXComposer sample combines Vertex Animation and a "halftone" imaging shader

mandelbrotPS3

mandelbrotPS3 is a numerically-demanding example of pixel shader dynamic branching. Change the # of iterations at run time for varying precision effects

fireball

volume-texture fireball

durerDusk

durerDusk shows a non-photo-real shading effect, designed to emulate a style of cross-hatched two-layer pen drawing

lambSkinDusk

lambSkinDusk shows a cheap, fast way to emulate subsurface light scattering effects. The overall image is further enhanced by a sepia-tone pass

September 2004

glowTrailFP

glowTrailFP two simple models with image process sweetening. Be sure to hit the "play" button. These objects leave persistent but fading images behind as the scene moves. The uses persistent render-to-texture for animated effect. Each frame is rendered to a texture, blurred and saved from frame-to-frame. Each frame, the previous blur is faded slightly before being added to the new scene.

Image Postprocessing

August 2004

displace2

Show vertex-shader texture fetch for displaced surface. Changing the tesselation paramters of the cylinder will alter the effeciveness of this technique, depending on the texture chosen. Remember that the texture must be in 32-bit-fp format

blendLayers

The "blendLayers' FXComposer sample shows typical material effects, plus imaging "blend modes" (much like those found in programs like Adobe Photoshop™), encapsulated as pixel shaders

May 2004

tonemap

tonemap shows high-dynamic-range imaging effects by permitting the user to control the exposure and look of a "deep pixel" image

Image Postprocessing

corona

Animated noisy glow effects around each object, "Corona" is an animated extension of "post_halo" and "post_glowTrail" with the simple addition of noise. Objects are rendered into a texture, that texture swizzled and blurred, noise used to repeatedly offset the texels, and over several frames each new frame is tinted, faded, and moved by noise to a new location for a fire-like effect around the edges of each object.

Image Postprocessing

spinFX

spinFX shows accumulation-buffer motion blur. By default a SINGLE motion-blurred frame is drawn. Uncomment the USE_TIMER macro and recompile to enable animation.
Accumulation buffer effects are created by rendering the same object repeatedly, and accumulating the resultant pixels into a deep (FP16) "accumulation buffer." This is therefore a render-to-texture effect. For each subsequent re-rendering, the objects and/or camera are moved or changed slightly. Once the accumulation passes are complete, the resultant floating-point pixels are re-averaged into a viewable and nicely-blurred picture. Controls in the shader determine the balance between render speed (a small number of samples) and blur quality (a large number of samples).

Image Postprocessing